Per Monsee.Come mi hai consigliato allego logfile:
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 7.32.31, on 21/01/2009
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16762)
Boot mode: Normal

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\csrss.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\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
C:\Programmi\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\system32\brsvc01a.exe
C:\WINDOWS\system32\brss01a.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\drivers\CDAC11BA.EXE
C:\WINDOWS\eHome\ehRecvr.exe
C:\WINDOWS\eHome\ehSched.exe
C:\Programmi\Google\Common\Google Updater\GoogleUpdaterService.exe
C:\Programmi\Java\jre6\bin\jqs.exe
C:\Programmi\Pinnacle\MediaServer\Microsoft SQL Server\MSSQL$PINNACLESYS\Binn\sqlservr.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\Programmi\Spyware Doctor\pctsAuxs.exe
C:\Programmi\Spyware Doctor\pctsSvc.exe
C:\WINDOWS\ehome\ehtray.exe
C:\WINDOWS\RTHDCPL.EXE
C:\Programmi\CyberLink DVD Solution\PowerDVD\PDVDServ.exe
C:\WINDOWS\eHome\ehmsas.exe
C:\Programmi\ScanSoft\PaperPort\pptd40nt.exe
C:\Programmi\Brother\ControlCenter2\brctrcen.exe
C:\Programmi\File comuni\Real\Update_OB\realsched.exe
C:\VEXPLITE\MONLITE.EXE
C:\Programmi\Java\jre6\bin\jusched.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\Programmi\Google\Google Desktop Search\GoogleDesktop.exe
C:\Programmi\Spyware Doctor\pctsTray.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\DNA\btdna.exe
C:\Programmi\DAEMON Tools Lite\daemon.exe
C:\Programmi\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
C:\Programmi\Brother\Brmfcmon\BrMfcWnd.exe
C:\Programmi\ADSL\StarModem ADSL USB MODEM\dslmon.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Brother\Brmfcmon\BrMfcmon.exe
C:\VEXPLITE\viritsvc.exe
c:\programmi\pinnacle\shared files\programs\mediaserver\pmshost.exe
C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe
C:\Programmi\Alwil Software\Avast4\ashWebSv.exe
C:\WINDOWS\system32\dllhost.exe
C:\WINDOWS\System32\alg.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\Programmi\Outlook Express\msimn.exe
C:\Programmi\Trend Micro\HijackThis\HijackThis.exe
C:\WINDOWS\system32\wbem\wmiprvse.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.beppegrillo.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 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\File comuni\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: RealPlayer Download and Record Plugin for Internet Explorer - {3049C3E9-B461-4BC5-8870-4C09146192CA} - C:\Programmi\Real\RealPlayer\rpbrowserrecordplugin.dll
O2 - BHO: Java(tm) Plug-In SSV Helper - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Programmi\Java\jre6\bin\ssv.dll
O2 - BHO: NOW!Imaging - {9AA2F14F-E956-44B8-8694-A5B615CDF341} - (no file)
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Programmi\Google\GoogleToolbarNotifier\5.0.926.3450\swg.dll
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: SYSTRAN Web Translator 5.0 - {A5899B52-3AF9-4F56-85FE-AD7B3BE8490F} - C:\Programmi\SYSTRAN\5.0\Personal\IEPlugIn.dll
O4 - HKLM\..\Run: [ehTray] C:\WINDOWS\ehome\ehtray.exe
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [SkyTel] SkyTel.EXE
O4 - HKLM\..\Run: [RTHDCPL] RTHDCPL.EXE
O4 - HKLM\..\Run: [RemoteControl] "C:\Programmi\CyberLink DVD Solution\PowerDVD\PDVDServ.exe"
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [SSBkgdUpdate] "C:\Programmi\File comuni\Scansoft Shared\SSBkgdUpdate\SSBkgdupdate.exe" -Embedding -boot
O4 - HKLM\..\Run: [PaperPort PTD] C:\Programmi\ScanSoft\PaperPort\pptd40nt.exe
O4 - HKLM\..\Run: [IndexSearch] C:\Programmi\ScanSoft\PaperPort\IndexSearch.exe
O4 - HKLM\..\Run: [ControlCenter2.0] C:\Programmi\Brother\ControlCenter2\brctrcen.exe /autorun
O4 - HKLM\..\Run: [TkBellExe] "C:\Programmi\File comuni\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [PinnacleDriverCheck] C:\WINDOWS\system32\PSDrvCheck.exe -CheckReg
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [VIRIT LITE MONITOR] C:\VEXPLITE\MONLITE.EXE
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\Java\jre6\bin\jusched.exe"
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [Google Desktop Search] "C:\Programmi\Google\Google Desktop Search\GoogleDesktop.exe" /startup
O4 - HKLM\..\Run: [ISTray] "C:\Programmi\Spyware Doctor\pctsTray.exe"
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Programmi\Adobe\Reader 8.0\Reader\Reader_sl.exe"
O4 - HKCU\..\Run: [NBJ] "C:\Programmi\Ahead\Nero BackItUp\NBJ.exe"
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [BitTorrent DNA] "C:\Programmi\DNA\btdna.exe"
O4 - HKCU\..\Run: [DAEMON Tools Lite] "C:\Programmi\DAEMON Tools Lite\daemon.exe" -autorun
O4 - HKCU\..\Run: [swg] C:\Programmi\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
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 - .DEFAULT User Startup: OpenOffice.org 1.1.4.lnk = C:\Programmi\OpenOffice.org1.1.4\program\quickstart.exe (User 'Default user')
O4 - Global Startup: Controllo dello stato.lnk = C:\Programmi\Brother\Brmfcmon\BrMfcWnd.exe
O4 - Global Startup: DSLMON.lnk = ?
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=http://www.ciaoweb.it
O16 - DPF: DownloadInformation -
O17 - HKLM\System\CCS\Services\Tcpip\..\{6BA87476-DA4A-42DE-AEEC-A257A3E632A4}: NameServer = 193.70.152.15 193.70.152.25
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - ALWIL Software - C:\Programmi\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - ALWIL Software - C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe
O23 - Service: avast! Web Scanner - ALWIL Software - C:\Programmi\Alwil Software\Avast4\ashWebSv.exe
O23 - Service: BrSplService (Brother XP spl Service) - brother Industries Ltd - C:\WINDOWS\system32\brsvc01a.exe
O23 - Service: C-DillaCdaC11BA - C-Dilla Ltd - C:\WINDOWS\system32\drivers\CDAC11BA.EXE
O23 - Service: Google Desktop Manager 5.8.811.4345 (GoogleDesktopManager-110408-113106) - Google - C:\Programmi\Google\Google Desktop Search\GoogleDesktop.exe
O23 - Service: Google Updater Service (gusvc) - Google - C:\Programmi\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programmi\File comuni\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Programmi\Java\jre6\bin\jqs.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: Pinnacle Systems Media Service (PinnacleSys.MediaServer) - Pinnacle Systems - c:\programmi\pinnacle\shared files\programs\mediaserver\pmshost.exe
O23 - Service: PC Tools Auxiliary Service (sdAuxService) - PC Tools - C:\Programmi\Spyware Doctor\pctsAuxs.exe
O23 - Service: PC Tools Security Service (sdCoreService) - PC Tools - C:\Programmi\Spyware Doctor\pctsSvc.exe
O23 - Service: Virit eXplorer Lite (viritsvclite) - TG Soft Sas www.tgsoft.it - C:\VEXPLITE\viritsvc.exe

--
End of file - 9218 bytes
Io uso Mozilla non IE.Ho cercato di entrare nella cartella C:\system\volume information\etc dove e' allocato il trojan
ma non l'ho trovata in esplora risorse.Come arrivarci????
Grazie

il fatto che usi firefox non significa che non puoi usare i.e.!devi averlo installato sul pc e,a volte.quelle scansioni online risolvono o chiariscono le cose,almeno,nel mio caso è stato cosi' in piu di un occasione!