Se non hai modificato alcuna impostazione, beh, sì: non è normale che ti si cambi il punto d'arrivo dei download.
Tu usi un download-manager? Se sì, quale?
... ma anche se avessi beccato un qualche "fetecchione", prova non v'è che ci possa in qualche modo entrare quel tuo contatto in MSN.

Non ho modificato impostazioni. Non uso download manager, utilizzo quello predefinito di Firefox che ho dovuto riconfigurare perché era cambiata la directory di destinazione. Avevo installato per errore "Speed downloading" che ho subito disinstallato, non so se possa essere stato quello.

Ok, grazie, allora non dovrebbe essere qualcosa di rischioso, il fatto è che anche dopo averlo disinstallato Firefox ha di nuovo spostato in quella posizione i downloads....

Ecco il log:
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 12.29.28, on 30/11/2008
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16735)
Boot mode: Normal

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\brsvc01a.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\brss01a.exe
C:\WINDOWS\ehome\ehtray.exe
C:\WINDOWS\RTHDCPL.EXE
C:\Programmi\Sonic\DigitalMedia LE v7\MyDVD LE\DetectorApp.exe
C:\Programmi\File comuni\InstallShield\UpdateService\issch.exe
C:\apps\ABoard\ABoard.exe
C:\apps\ABoard\AOSD.exe
C:\Programmi\Nero\Nero 7\InCD\InCD.exe
C:\Programmi\Microsoft Office\Office12\GrooveMonitor.exe
C:\Programmi\Adobe\Photoshop Elements 5.0\apdproxy.exe
C:\Programmi\ScanSoft\OmniPageSE2.0\OpwareSE2.exe
C:\Programmi\EPSON\ESM2\eEBSVC.exe
C:\Programmi\Adobe\Photoshop Elements 5.0\PhotoshopElementsFileAgent.exe
C:\Programmi\Microsoft IntelliType Pro\type32.exe
C:\Programmi\Kaspersky Lab\Kaspersky Anti-Virus 7.0\avp.exe
C:\WINDOWS\system32\rundll32.exe
C:\Programmi\Adobe\Acrobat 8.0\Acrobat\Acrotray.exe
C:\WINDOWS\system32\Brmfrmps.exe
C:\Programmi\Nokia\Nokia Software Launcher\NSLauncher.exe
C:\Programmi\ScanSoft\PaperPort\pptd40nt.exe
C:\WINDOWS\eHome\ehRecvr.exe
C:\WINDOWS\eHome\ehSched.exe
C:\Programmi\Nero\Nero 7\InCD\InCDsrv.exe
C:\Programmi\MagicTune Premium\MagicTuneEngine.exe
C:\WINDOWS\system32\RUNDLL32.EXE
C:\WINDOWS\system32\nvsvc32.exe
C:\VEXPLITE\MONLITE.EXE
C:\Programmi\Kaspersky Lab\Kaspersky Anti-Virus 7.0\avp.exe
c:\Programmi\File comuni\Protexis\License Service\PsiService_2.exe
C:\Programmi\File comuni\Ahead\Lib\NMBgMonitor.exe
C:\Programmi\DAEMON Tools\daemon.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\File comuni\Ulead Systems\DVD\ULCDRSvr.exe
C:\Programmi\Sonic\DigitalMedia LE v7\MyDVD LE\USBDeviceService.exe
C:\WINDOWS\system32\ctfmon.exe
C:\VEXPLITE\viritsvc.exe
C:\Programmi\File comuni\Ahead\Lib\NMIndexStoreSvr.exe
C:\Programmi\Microsoft ActiveSync\wcescomm.exe
C:\Programmi\Sprite Software\Sprite Backup\SpriteService.exe
C:\PROGRA~1\COMMON~1\X10\Common\x10nets.exe
C:\PROGRA~1\MI3AA1~1\rapimgr.exe
C:\Programmi\Windows Live\Messenger\MsnMsgr.Exe
C:\WINDOWS\system32\dllhost.exe
C:\Programmi\File comuni\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
C:\Programmi\MagicTune Premium\GammaTray.exe
C:\Programmi\PC Connectivity Solution\ServiceLayer.exe
C:\WINDOWS\eHome\ehmsas.exe
C:\Programmi\PIXELA\ImageMixer for HDD Camcorder\IMx3Launcher.exe
C:\Programmi\Brother\Brmfcmon\BrMfcWnd.exe
C:\Programmi\MagicTune Premium\MagicTune.exe
C:\WINDOWS\system32\wscntfy.exe
C:\Programmi\File comuni\Ahead\Lib\NMIndexingService.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\Programmi\Java\jre6\bin\jqs.exe
C:\WINDOWS\system32\wbem\wmiapsrv.exe
C:\Programmi\Microsoft Office\Office12\OUTLOOK.EXE
C:\Programmi\Windows Live\Messenger\usnsvc.exe
C:\Programmi\BitTorrent\bittorrent.exe
C:\WINDOWS\explorer.exe
C:\Programmi\Trend Micro\HijackThis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.it/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://format.packardbell.com/cgi-bin/redirect/?country=IT&range=AD&phase=7&key=KBF01
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
R3 - URLSearchHook: Live TV Toolbar - {b69a9db4-d0a1-4722-b56b-f20757a29cdf} - (no file)
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\File comuni\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: Groove GFS Browser Helper - {72853161-30C5-4D22-B7F9-0BBC1D38A37E} - C:\Programmi\Microsoft Office\Office12\GrooveShellExtensions.dll
O2 - BHO: Java(tm) Plug-In SSV Helper - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Programmi\Java\jre6\bin\ssv.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: Adobe PDF Conversion Toolbar Helper - {AE7CD045-E861-484f-8273-0445EE161910} - C:\Programmi\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll
O2 - BHO: Live TV Toolbar - {b69a9db4-d0a1-4722-b56b-f20757a29cdf} - (no file)
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Programmi\Java\jre6\bin\jp2ssv.dll
O2 - BHO: JQSIEStartDetectorImpl - {E7E6F031-17CE-4C07-BC86-EABFE594F69C} - C:\Programmi\Java\jre6\lib\deploy\jqs\ie\jqs_plugin.dll
O3 - Toolbar: Easy-WebPrint - {327C2873-E90D-4c37-AA9D-10AC9BABA46C} - C:\Programmi\Canon\Easy-WebPrint\Toolband.dll
O3 - Toolbar: Adobe PDF - {47833539-D0C5-4125-9FA8-0819E2EAAC93} - C:\Programmi\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll
O4 - HKLM\..\Run: [PHIME2002ASync] C:\WINDOWS\system32\IME\TINTLGNT\TINTSETP.EXE /SYNC
O4 - HKLM\..\Run: [PHIME2002A] C:\WINDOWS\system32\IME\TINTLGNT\TINTSETP.EXE /IMEName
O4 - HKLM\..\Run: [ehTray] C:\WINDOWS\ehome\ehtray.exe
O4 - HKLM\..\Run: [RTHDCPL] RTHDCPL.EXE
O4 - HKLM\..\Run: [SkyTel] SkyTel.EXE
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [DetectorApp] C:\Programmi\Sonic\DigitalMedia LE v7\MyDVD LE\DetectorApp.exe
O4 - HKLM\..\Run: [ISUSScheduler] "C:\Programmi\File comuni\InstallShield\UpdateService\issch.exe" -start
O4 - HKLM\..\Run: [IMJPMIG8.1] "C:\WINDOWS\IME\imjp8_1\IMJPMIG.EXE /Spoil /RemAdvDef /Migration32"
O4 - HKLM\..\Run: [PostOOBE] C:\WINDOWS\system32\wscript.exe C:\DRIVERS\POSTOOBE.NEC //E:VBS
O4 - HKLM\..\Run: [ACTIVBOARD] c:\apps\ABoard\ABoard.exe
O4 - HKLM\..\Run: [NeroFilterCheck] C:\Programmi\File comuni\Ahead\Lib\NeroCheck.exe
O4 - HKLM\..\Run: [InCD] C:\Programmi\Nero\Nero 7\InCD\InCD.exe
O4 - HKLM\..\Run: [GrooveMonitor] "C:\Programmi\Microsoft Office\Office12\GrooveMonitor.exe"
O4 - HKLM\..\Run: [Adobe Photo Downloader] "C:\Programmi\Adobe\Photoshop Elements 5.0\apdproxy.exe"
O4 - HKLM\..\Run: [OpwareSE2] "C:\Programmi\ScanSoft\OmniPageSE2.0\OpwareSE2.exe"
O4 - HKLM\..\Run: [Easy-PrintToolBox] C:\Programmi\Canon\Easy-PrintToolBox\BJPSMAIN.EXE /logon
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Programmi\Adobe\Reader 8.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [type32] "C:\Programmi\Microsoft IntelliType Pro\type32.exe"
O4 - HKLM\..\Run: [BluetoothAuthenticationAgent] rundll32.exe bthprops.cpl,,BluetoothAuthenticationAgent
O4 - HKLM\..\Run: [Acrobat Assistant 8.0] "C:\Programmi\Adobe\Acrobat 8.0\Acrobat\Acrotray.exe"
O4 - HKLM\..\Run: [SSBkgdUpdate] "C:\Programmi\File comuni\Scansoft Shared\SSBkgdUpdate\SSBkgdupdate.exe" -Embedding -boot
O4 - HKLM\..\Run: [NSLauncher] C:\Programmi\Nokia\Nokia Software Launcher\NSLauncher.exe /startup
O4 - HKLM\..\Run: [PaperPort PTD] C:\Programmi\ScanSoft\PaperPort\pptd40nt.exe
O4 - HKLM\..\Run: [IndexSearch] C:\Programmi\ScanSoft\PaperPort\IndexSearch.exe
O4 - HKLM\..\Run: [SetDefPrt] C:\Programmi\Brother\Brmfl04a\BrStDvPt.exe
O4 - HKLM\..\Run: [ControlCenter2.0] C:\Programmi\Brother\ControlCenter2\brctrcen.exe /autorun
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [VIRIT LITE MONITOR] C:\VEXPLITE\MONLITE.EXE
O4 - HKLM\..\Run: [AVP] "C:\Programmi\Kaspersky Lab\Kaspersky Anti-Virus 7.0\avp.exe"
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\Java\jre6\bin\jusched.exe"
O4 - HKCU\..\Run: [BgMonitor_{79662E04-7C6C-4d9f-84C7-88D8A56B10AA}] "C:\Programmi\File comuni\Ahead\Lib\NMBgMonitor.exe"
O4 - HKCU\..\Run: [DAEMON Tools] "C:\Programmi\DAEMON Tools\daemon.exe" -lang 1033
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [H/PC Connection Agent] "C:\Programmi\Microsoft ActiveSync\wcescomm.exe"
O4 - HKCU\..\Run: [SpriteService] "C:\Programmi\Sprite Software\Sprite Backup\SpriteService.exe"
O4 - HKCU\..\Run: [LaunchList] C:\Programmi\Pinnacle\Studio 11\LaunchList2.exe
O4 - HKCU\..\Run: [MsnMsgr] "C:\Programmi\Windows Live\Messenger\MsnMsgr.Exe" /background
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVIZIO DI RETE')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - Global Startup: Adobe Acrobat Speed Launcher.lnk = ?
O4 - Global Startup: Adobe Acrobat Synchronizer.lnk = C:\Programmi\Adobe\Acrobat 8.0\Acrobat\AdobeCollabSync.exe
O4 - Global Startup: Controllo in background EPSON.lnk = C:\Programmi\EPSON\ESM2\Stms.exe
O4 - Global Startup: GammaTray.lnk = ?
O4 - Global Startup: ImageMixer for HDD Camcorder.lnk = C:\Programmi\PIXELA\ImageMixer for HDD Camcorder\IMx3Launcher.exe
O4 - Global Startup: Status Monitor.lnk = C:\Programmi\Brother\Brmfcmon\BrMfcWnd.exe
O8 - Extra context menu item: Aggiungi all'elenco di stampa Easy-WebPrint - res://C:\Programmi\Canon\Easy-WebPrint\Resource.dll/RC_AddToList.html
O8 - Extra context menu item: Anteprima Easy-WebPrint - res://C:\Programmi\Canon\Easy-WebPrint\Resource.dll/RC_Preview.html
O8 - Extra context menu item: Append to existing PDF - res://C:\Programmi\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIEAppend.html
O8 - Extra context menu item: Convert link target to Adobe PDF - res://C:\Programmi\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIECapture.html
O8 - Extra context menu item: Convert link target to existing PDF - res://C:\Programmi\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIEAppend.html
O8 - Extra context menu item: Convert selected links to Adobe PDF - res://C:\Programmi\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIECaptureSelLinks.html
O8 - Extra context menu item: Convert selected links to existing PDF - res://C:\Programmi\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIEAppendSelLinks.html
O8 - Extra context menu item: Convert selection to Adobe PDF - res://C:\Programmi\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIECapture.html
O8 - Extra context menu item: Convert selection to existing PDF - res://C:\Programmi\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIEAppend.html
O8 - Extra context menu item: Convert to Adobe PDF - res://C:\Programmi\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIECapture.html
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office12\EXCEL.EXE/3000
O8 - Extra context menu item: Stampa ad alta velocità Easy-WebPrint - res://C:\Programmi\Canon\Easy-WebPrint\Resource.dll/RC_HSPrint.html
O8 - Extra context menu item: Stampa Easy-WebPrint - res://C:\Programmi\Canon\Easy-WebPrint\Resource.dll/RC_Print.html
O9 - Extra button: Web Anti-Virus - {1F460357-8A94-4D71-9CA3-AA4ACF32ED8E} - C:\Programmi\Kaspersky Lab\Kaspersky Anti-Virus 7.0\SCIEPlgn.dll
O9 - Extra button: Invia a OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~2\Office12\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: I&nvia a OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~2\Office12\ONBttnIE.dll
O9 - Extra button: Create Mobile Favorite - {2EAF5BB1-070F-11D3-9307-00C04FAE2D4F} - C:\PROGRA~1\MI3AA1~1\INetRepl.dll
O9 - Extra button: (no name) - {2EAF5BB2-070F-11D3-9307-00C04FAE2D4F} - C:\PROGRA~1\MI3AA1~1\INetRepl.dll
O9 - Extra 'Tools' menuitem: Crea preferiti portatile... - {2EAF5BB2-070F-11D3-9307-00C04FAE2D4F} - C:\PROGRA~1\MI3AA1~1\INetRepl.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\Office12\REFIEBAR.DLL
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O14 - IERESET.INF: START_PAGE_URL=file://C:\APPS\IE\offline\it.htm
O18 - Protocol: grooveLocalGWS - {88FED34C-F0CA-4636-A375-3CB6248B04CD} - C:\Programmi\Microsoft Office\Office12\GrooveSystemServices.dll
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\FILECO~1\Skype\SKYPE4~1.DLL
O23 - Service: Adobe Active File Monitor V5 (AdobeActiveFileMonitor5.0) - Unknown owner - C:\Programmi\Adobe\Photoshop Elements 5.0\PhotoshopElementsFileAgent.exe
O23 - Service: Autodesk Licensing Service - Autodesk - C:\Programmi\File comuni\Autodesk Shared\Service\AdskScSrv.exe
O23 - Service: Kaspersky Anti-Virus 7.0 (AVP) - Kaspersky Lab - C:\Programmi\Kaspersky Lab\Kaspersky Anti-Virus 7.0\avp.exe
O23 - Service: Brother Popup Suspend service for Resource manager (brmfrmps) - Brother Industries, Ltd. - C:\WINDOWS\system32\Brmfrmps.exe
O23 - Service: BrSplService (Brother XP spl Service) - brother Industries Ltd - C:\WINDOWS\system32\brsvc01a.exe
O23 - Service: EpsonBidirectionalService - Unknown owner - C:\Programmi\EPSON\ESM2\eEBSVC.exe
O23 - Service: FLEXnet Licensing Service - Macrovision Europe Ltd. - C:\Programmi\File comuni\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
O23 - Service: InCD Helper (InCDsrv) - Nero AG - C:\Programmi\Nero\Nero 7\InCD\InCDsrv.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Programmi\Java\jre6\bin\jqs.exe
O23 - Service: MagicTuneEngine - Unknown owner - C:\Programmi\MagicTune Premium\MagicTuneEngine.exe
O23 - Service: NBService - Nero AG - C:\Programmi\Nero\Nero 7\Nero BackItUp\NBService.exe
O23 - Service: NMIndexingService - Nero AG - C:\Programmi\File comuni\Ahead\Lib\NMIndexingService.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: PCLEPCI - Pinnacle Systems GmbH - C:\WINDOWS\system32\drivers\pclepci.sys
O23 - Service: Protexis Licensing V2 (PSI_SVC_2) - Protexis Inc. - c:\Programmi\File comuni\Protexis\License Service\PsiService_2.exe
O23 - Service: ServiceLayer - Nokia. - C:\Programmi\PC Connectivity Solution\ServiceLayer.exe
O23 - Service: Ulead Burning Helper (UleadBurningHelper) - Ulead Systems, Inc. - C:\Programmi\File comuni\Ulead Systems\DVD\ULCDRSvr.exe
O23 - Service: USBDeviceService - Unknown owner - C:\Programmi\Sonic\DigitalMedia LE v7\MyDVD LE\USBDeviceService.exe
O23 - Service: Virit eXplorer Lite (viritsvclite) - TG Soft Sas www.tgsoft.it - C:\VEXPLITE\viritsvc.exe
O23 - Service: X10 Device Network Service (x10nets) - X10 - C:\PROGRA~1\COMMON~1\X10\Common\x10nets.exe

--
End of file - 15383 bytes

Grazie ancora

Ok, mi metto al lavoro...