Fatti entrambi, non sapendo se e come si possa allegare un log, ne faccio un copia e incolla.
Ecco prima il log di Malwarebytes:


Malwarebytes Anti-Malware 1.60.1.1000
www.malwarebytes.org

Versione database: v2012.02.16.02

Windows XP Service Pack 3 x86 NTFS
Internet Explorer 8.0.6001.18702
Administrator :: GE-DF7315F2EBC6 [amministratore]

21/02/2012 13.32.12
mbam-log-2012-02-21 (18-58-00).txt

Tipo di scansione: Scansione completa
Opzioni di scansione attive: Memoria | Esecuzione automatica | Registro | File system | Euristica/Extra | Euristica/Shuriken | PUP | PUM
Opzioni di scansione disattivate: P2P
Elementi esaminati: 270238
Tempo impiegato: 1 ore, 28 minuti, 42 secondi

Processi rilevati in memoria: 0
(non sono stati rilevati elementi nocivi)

Moduli di memoria rilevati: 0
(non sono stati rilevati elementi nocivi)

Chiavi di registro rilevate: 0
(non sono stati rilevati elementi nocivi)

Valori di registro rilevati: 0
(non sono stati rilevati elementi nocivi)

Voci rilevate nei dati di registro: 2
HKLM\SOFTWARE\Microsoft\Security Center|AntiVirusDisableNotify (PUM.Disabled.SecurityCenter) -> Cattivo: (1) Buono: (0) -> Nessuna azione intrapresa.
HKLM\SOFTWARE\Microsoft\Security Center|FirewallDisableNotify (PUM.Disabled.SecurityCenter) -> Cattivo: (1) Buono: (0) -> Nessuna azione intrapresa.

Cartelle rilevate: 0
(non sono stati rilevati elementi nocivi)

File rilevati: 1
C:\copia USB disk\Scarichi eseguibili\MediaPlayerSetup.exe (Adware.Agent) -> Nessuna azione intrapresa.

(fine)

E poi quello di HJT:


Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 19.05.29, on 21/02/2012
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v8.00 (8.00.6001.18702)
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:\Programmi\Microsoft Security Client\Antimalware\MsMpEng.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\LEXBCES.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\LEXPPS.EXE
C:\WINDOWS\Explorer.EXE
C:\Programmi\Analog Devices\Core\smax4pnp.exe
C:\WINDOWS\system32\igfxpers.exe
C:\Programmi\Lexmark X1100 Series\lxbkbmgr.exe
C:\Programmi\Lexmark X1100 Series\lxbkbmon.exe
C:\Programmi\SlySoft\AnyDVD\AnyDVD.exe
C:\Programmi\Microsoft Security Client\msseces.exe
C:\WINDOWS\system32\ICO.EXE
C:\Programmi\File comuni\Nokia\MPlatform\NokiaMServer.exe
C:\Programmi\Ask.com\Updater\Updater.exe
C:\WINDOWS\PixArt\PAC7302\Monitor.exe
C:\Programmi\File comuni\Java\Java Update\jusched.exe
C:\Programmi\Samsung\Kies\KiesTrayAgent.exe
C:\Programmi\File comuni\Spigot\Search Settings\SearchSettings.exe
C:\Programmi\iTunes\iTunesHelper.exe
C:\Programmi\Adobe\Reader 9.0\Reader\Reader_sl.exe
C:\Programmi\File comuni\Apple\Mobile Device Support\AppleMobileDeviceService.exe
C:\programmi\real\realplayer\update\realsched.exe
C:\WINDOWS\system32\rundll32.exe
C:\Programmi\Bonjour\mDNSResponder.exe
C:\Programmi\Microsoft Student\Microsoft Encarta 2009 - Premium + Student DVD\EDICT.EXE
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
C:\Programmi\Belkin\Software Bluetooth\bin\btwdins.exe
C:\Programmi\Kerkia\Minimem\minimem.exe
C:\Programmi\Messenger\msmsgs.exe
C:\Programmi\Java\jre6\bin\jqs.exe
C:\Programmi\Nero\Update\NASvc.exe
C:\Programmi\Samsung\Kies\External\FirmwareUpdate\KiesPDLR.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Belkin\Software Bluetooth\BTTray.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Programmi\iPod\bin\iPodService.exe
C:\WINDOWS\system32\wscntfy.exe
C:\WINDOWS\System32\svchost.exe
C:\Programmi\PC Connectivity Solution\ServiceLayer.exe
C:\Programmi\PC Connectivity Solution\Transports\NclUSBSrv.exe
C:\Programmi\PC Connectivity Solution\Transports\NclRSSrv.exe
C:\Programmi\Trend Micro\HijackThis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://translate.google.it/?hl=it&ie=UTF-8&tab=wT#
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=56626&homepage=http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
R3 - URLSearchHook: YouTube Downloader Toolbar - {F3FEE66E-E034-436a-86E4-9690573BEE8A} - C:\Programmi\YouTube Downloader Toolbar\IE\4.9\youtubedownloaderToolbarIE.dll
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Programmi\File comuni\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: RealPlayer Download and Record Plugin for Internet Explorer - {3049C3E9-B461-4BC5-8870-4C09146192CA} - C:\Documents and Settings\All Users\Dati applicazioni\Real\RealPlayer\BrowserRecordPlugin\IE\rpbrowserrecordplugin.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - C:\Programmi\Google\Google Toolbar\GoogleToolbar_32.dll
O2 - BHO: SkypeIEPluginBHO - {AE805869-2E5C-4ED4-8F7B-F1F7851A4497} - C:\Programmi\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Programmi\Google\GoogleToolbarNotifier\5.7.7227.1100\swg.dll
O2 - BHO: Ask Toolbar BHO - {D4027C7F-154A-4066-A1AD-4243D8127440} - C:\Programmi\Ask.com\GenericAskToolbar.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
O2 - BHO: YouTube Downloader Toolbar - {F3FEE66E-E034-436a-86E4-9690573BEE8A} - C:\Programmi\YouTube Downloader Toolbar\IE\4.9\youtubedownloaderToolbarIE.dll
O3 - Toolbar: Nero Toolbar - {D4027C7F-154A-4066-A1AD-4243D8127440} - C:\Programmi\Ask.com\GenericAskToolbar.dll
O3 - Toolbar: YouTube Downloader Toolbar - {F3FEE66E-E034-436a-86E4-9690573BEE8A} - C:\Programmi\YouTube Downloader Toolbar\IE\4.9\youtubedownloaderToolbarIE.dll
O3 - Toolbar: Google Toolbar - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - C:\Programmi\Google\Google Toolbar\GoogleToolbar_32.dll
O4 - HKLM\..\Run: [SoundMAXPnP] C:\Programmi\Analog Devices\Core\smax4pnp.exe
O4 - HKLM\..\Run: [Persistence] C:\WINDOWS\system32\igfxpers.exe
O4 - HKLM\..\Run: [Lexmark X1100 Series] "C:\Programmi\Lexmark X1100 Series\lxbkbmgr.exe"
O4 - HKLM\..\Run: [AnyDVD] C:\Programmi\SlySoft\AnyDVD\AnyDVD.exe
O4 - HKLM\..\Run: [MSC] "c:\Programmi\Microsoft Security Client\msseces.exe" -hide -runkey
O4 - HKLM\..\Run: [PMX Daemon] ICO.EXE
O4 - HKLM\..\Run: [NokiaMServer] C:\Programmi\File comuni\Nokia\MPlatform\NokiaMServer /watchfiles startup
O4 - HKLM\..\Run: [ApnUpdater] "C:\Programmi\Ask.com\Updater\Updater.exe"
O4 - HKLM\..\Run: [PAC7302_Monitor] C:\WINDOWS\PixArt\PAC7302\Monitor.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\File comuni\Java\Java Update\jusched.exe"
O4 - HKLM\..\Run: [APSDaemon] "C:\Programmi\File comuni\Apple\Apple Application Support\APSDaemon.exe"
O4 - HKLM\..\Run: [KiesTrayAgent] C:\Programmi\Samsung\Kies\KiesTrayAgent.exe
O4 - HKLM\..\Run: [SearchSettings] "C:\Programmi\File comuni\Spigot\Search Settings\SearchSettings.exe"
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [iTunesHelper] "C:\Programmi\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Programmi\Adobe\Reader 9.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [Adobe ARM] "C:\Programmi\File comuni\Adobe\ARM\1.0\AdobeARM.exe"
O4 - HKLM\..\Run: [TkBellExe] "C:\programmi\real\realplayer\update\realsched.exe" -osboot
O4 - HKLM\..\Run: [BluetoothAuthenticationAgent] rundll32.exe bthprops.cpl,,BluetoothAuthenticationAgent
O4 - HKCU\..\Run: [L09IXLRD_21879812] "C:\Programmi\Microsoft Student\Microsoft Encarta 2009 - Premium + Student DVD\EDICT.EXE" -m
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [swg] "C:\Programmi\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe"
O4 - HKCU\..\Run: [Minimem] C:\Programmi\Kerkia\Minimem\minimem.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [Google Update] "C:\Documents and Settings\Administrator\Impostazioni locali\Dati applicazioni\Google\Update\GoogleUpdate.exe" /c
O4 - HKCU\..\Run: [KiesHelper] C:\Programmi\Samsung\Kies\KiesHelper.exe /s
O4 - HKCU\..\Run: [KiesPDLR] C:\Programmi\Samsung\Kies\External\FirmwareUpdate\KiesPDLR.exe
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\S-1-5-18\..\Run: [DWQueuedReporting] "c:\PROGRA~1\FILECO~1\MICROS~1\DW\dwtrig20.exe" -t (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - Global Startup: BTTray.lnk = ?
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O8 - Extra context menu item: Invia a &Bluetooth - C:\Programmi\Belkin\Software Bluetooth\btsendto_ie_ctx.htm
O9 - Extra button: Skype Plug-In - {898EA8C8-E7FF-479B-8935-AEC46303B9E5} - C:\Programmi\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O9 - Extra 'Tools' menuitem: Skype Plug-In - {898EA8C8-E7FF-479B-8935-AEC46303B9E5} - C:\Programmi\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: Barra di ricerca di Encarta - {B205A35E-1FC4-4CE3-818B-899DBBB3388C} - C:\Programmi\File comuni\Microsoft Shared\Encarta Search Bar\ENCSBAR.DLL
O9 - Extra button: @btrez.dll,-4015 - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Programmi\Belkin\Software Bluetooth\btsendto_ie.htm
O9 - Extra 'Tools' menuitem: @btrez.dll,-4017 - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Programmi\Belkin\Software Bluetooth\btsendto_ie.htm
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
O16 - DPF: {8100D56A-5661-482C-BEE8-AFECE305D968} (Facebook Photo Uploader 5 Control) - http://upload.facebook.com/controls/2009.07.28_v5.5.8.1/FacebookPhotoUploader55.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/get/shockwave/cabs/flash/swflash.cab
O16 - DPF: {E2883E8F-472F-4FB0-9522-AC9BF37916A7} - http://platformdl.adobe.com/NOS/getPlusPlus/1.6/gp.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{5D9B471D-26CA-43A4-944C-AF7340329093}: NameServer = 192.168.1.1
O18 - Protocol: skype-ie-addon-data - {91774881-D725-4E58-B298-07617B9B86A8} - C:\Programmi\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O23 - Service: Apple Mobile Device - Apple Inc. - C:\Programmi\File comuni\Apple\Mobile Device Support\AppleMobileDeviceService.exe
O23 - Service: Servizio Bonjour (Bonjour Service) - Apple Inc. - C:\Programmi\Bonjour\mDNSResponder.exe
O23 - Service: Bluetooth Service (btwdins) - WIDCOMM, Inc. - C:\Programmi\Belkin\Software Bluetooth\bin\btwdins.exe
O23 - Service: Google Update Service (gupdate) (gupdate) - Google Inc. - C:\Programmi\Google\Update\GoogleUpdate.exe
O23 - Service: Servizio Google Update (gupdatem) (gupdatem) - Google Inc. - C:\Programmi\Google\Update\GoogleUpdate.exe
O23 - Service: Google Software Updater (gusvc) - Google - C:\Programmi\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: Servizio iPod (iPod Service) - Apple Inc. - C:\Programmi\iPod\bin\iPodService.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Programmi\Java\jre6\bin\jqs.exe
O23 - Service: LexBce Server (LexBceS) - Lexmark International, Inc. - C:\WINDOWS\system32\LEXBCES.EXE
O23 - Service: @C:\Programmi\Nero\Update\NASvc.exe,-200 (NAUpdate) - Nero AG - C:\Programmi\Nero\Update\NASvc.exe
O23 - Service: ServiceLayer - Nokia - C:\Programmi\PC Connectivity Solution\ServiceLayer.exe

--
End of file - 11382 bytes

Grazie 1000!