Esegui 
Credevo di aver preso un virus, ma AntiVir non ha rilevato niente.
Metto anche il log di HijackThis nel caso servisse:
Logfile of Trend Micro HijackThis v2.0.0 (BETA)
Scan saved at 21.48.08, on 21/01/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
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\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\AntiVir PersonalEdition Classic\sched.exe
C:\WINDOWS\asuskbservice.exe
C:\WINDOWS\system32\CTSvcCDA.exe
C:\Programmi\File comuni\LightScribe\LSSrvc.exe
C:\Programmi\File comuni\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\WINDOWS\system32\nvsvc32.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\QuickTime\qttask.exe
C:\Programmi\iTunes\iTunesHelper.exe
C:\Programmi\Creative\ShareDLL\CtNotify.exe
C:\Programmi\Java\jre1.6.0_02\bin\jusched.exe
C:\WINDOWS\system32\RUNDLL32.EXE
C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_FATIAAE.EXE
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Messenger\msmsgs.exe
C:\Programmi\SUPERAntiSpyware\SUPERAntiSpyware.exe
C:\Programmi\Creative\ShareDLL\MediaDet.Exe
C:\Programmi\iPod\bin\iPodService.exe
C:\Programmi\ZyDAS\ZD1211 802.11g Utility\ZDWlan.exe
C:\Programmi\WLAN Technology Corporation\WLAN_802.11g_Utility\ZDWlan.exe
C:\WINDOWS\System32\svchost.exe
C:\Programmi\MSN Messenger\usnsvc.exe
C:\WINDOWS\system32\NOTEPAD.EXE
C:\Programmi\MSN Messenger\msnmsgr.exe
C:\Programmi\AntiVir PersonalEdition Classic\avgnt.exe
C:\Programmi\AntiVir PersonalEdition Classic\avguard.exe
C:\Programmi\Windows Media Player\wmplayer.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\Documents and Settings\vin\Desktop\HiJackThis_v2.exe
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: Supporto di collegamento per Adobe PDF Reader - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\File comuni\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Programmi\Java\jre1.6.0_02\bin\ssv.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [anvshell] anvshell.exe
O4 - HKLM\..\Run: [UpdReg] C:\WINDOWS\UpdReg.EXE
O4 - HKLM\..\Run: [Speed racer] C:\Programmi\Creative\PlayCenter\CTSRReg.exe
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [iTunesHelper] "C:\Programmi\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [Disc Detector] C:\Programmi\Creative\ShareDLL\CtNotify.exe
O4 - HKLM\..\Run: [Collegamento alla pagina delle proprietà di High Definition Audio] HDAShCut.exe
O4 - HKLM\..\Run: [Jet Detection] C:\Programmi\Creative\SBLive\PROGRAM\ADGJDet.exe
O4 - HKLM\..\Run: [MsgCenterExe] "C:\Programmi\File comuni\Real\Update_OB\RealOneMessageCenter.exe" -osboot
O4 - HKLM\..\Run: [avgnt] "C:\Programmi\AntiVir PersonalEdition Classic\avgnt.exe" /min
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\Java\jre1.6.0_02\bin\jusched.exe"
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [EPSON Stylus D68 Series] C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_FATIAAE.EXE /P23 "EPSON Stylus D68 Series" /O6 "USB001" /M "Stylus D68"
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [Citrus Alarm Clock] C:\Programmi\Citrus Alarm Clock\citrusac.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [drvsyskit] C:\WINDOWS\system32\drivers\hidr.exe
O4 - HKCU\..\Run: [SUPERAntiSpyware] C:\Programmi\SUPERAntiSpyware\SUPERAntiSpyware.exe
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 - Startup: ZDWLan Utility.lnk = C:\Programmi\WLAN Technology Corporation\WLAN_802.11g_Utility\ZDWlan.exe
O4 - Global Startup: Adobe Gamma Loader.exe.lnk = C:\Programmi\File comuni\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Adobe Reader Synchronizer.lnk = C:\Programmi\Adobe\Reader 8.0\Reader\AdobeCollabSync.exe
O4 - Global Startup: Avvio veloce di Adobe Reader.lnk = C:\Programmi\Adobe\Reader 8.0\Reader\reader_sl.exe
O4 - Global Startup: ZDWlan.lnk = ?
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.6.0_02\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.6.0_02\bin\ssv.dll
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
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: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://acs.pandasoftware.com/activescan ... asinst.cab
O20 - Winlogon Notify: !SASWinLogon - C:\Programmi\SUPERAntiSpyware\SASWINLO.dll
O22 - SharedTaskScheduler: Precaricatore Browseui - {438755C2-A8BA-11D1-B96B-00A0C90312E1} - C:\WINDOWS\system32\browseui.dll
O22 - SharedTaskScheduler: Daemon di cache delle categorie di componenti - {8C7461EF-2B13-11d2-BE35-3078302C2030} - C:\WINDOWS\system32\browseui.dll
O23 - Service: AntiVir PersonalEdition Classic Scheduler (AntiVirScheduler) - Avira GmbH - C:\Programmi\AntiVir PersonalEdition Classic\sched.exe
O23 - Service: AntiVir PersonalEdition Classic Guard (AntiVirService) - Avira GmbH - C:\Programmi\AntiVir PersonalEdition Classic\avguard.exe
O23 - Service: ASUSKeyboardService - ASUSTeK COMPUTER INC. - C:\WINDOWS\asuskbservice.exe
O23 - Service: Creative Service for CDROM Access - Creative Technology Ltd - C:\WINDOWS\system32\CTSvcCDA.exe
O23 - Service: Servizio iPod (iPod Service) - Apple Inc. - C:\Programmi\iPod\bin\iPodService.exe
O23 - Service: LightScribeService Direct Disc Labeling Service (LightScribeService) - Unknown owner - C:\Programmi\File comuni\LightScribe\LSSrvc.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
--
End of file - 6876 bytes
