Esegui 
Battendo ctrl+alt+can compara il task manager, e allora chiudendo quello il pc si ristabilisce funzionante.
Mi sembra di avere qualche processo in più, cioè solitamente stavo sui 38, adesso sono 46 e non ho istallato niente!!
Se qualche esperto riesce a scoprire se c'è qualche processo "strano" mi fa un piacere enorme!!!!
Ce ne sono due che secondo me sono strani, li ho messi in grassetto
Logfile of HijackThis v1.99.1
Scan saved at 17.55.09, on 21/12/2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.5730.0011)
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\ibmpmsvc.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\Programmi\Intel\Wireless\Bin\S24EvMon.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\tp4serv.exe
C:\WINDOWS\system32\igfxtray.exe
C:\WINDOWS\system32\hkcmd.exe
C:\WINDOWS\system32\igfxpers.exe
C:\WINDOWS\system32\igfxsrvc.exe
C:\Programmi\Analog Devices\Core\smax4pnp.exe
C:\Programmi\Lenovo\HOTKEY\TPOSDSVC.exe
C:\Programmi\Java\jre1.6.0\bin\jusched.exe
C:\Programmi\File comuni\Lenovo\Scheduler\scheduler_proxy.exe
C:\PROGRA~1\Grisoft\AVG7\avgcc.exe
C:\WINDOWS\system32\ctfmon.exe
C:\WINDOWS\system32\acs.exe
C:\Programmi\Lenovo\HOTKEY\TPONSCR.exeC:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
C:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
C:\Programmi\Intel\Wireless\Bin\EvtEng.exe
C:\Programmi\File comuni\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\Programmi\Microsoft Private Folder 1.0\PrfldSvc.exe
C:\Programmi\Intel\Wireless\Bin\RegSrvc.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\File comuni\Lenovo\tvt_reg_monitor_svc.exe
C:\Programmi\Lenovo\Rescue and Recovery\rrpservice.exe
C:\Programmi\Lenovo\Rescue and Recovery\rrservice.exe
C:\Programmi\File comuni\Lenovo\Scheduler\tvtsched.exe
C:\Programmi\Lenovo\Rescue and Recovery\ADM\IUService.exe
C:\Programmi\File comuni\Lenovo\Logger\logmon.exe
C:\WINDOWS\system32\taskmgr.exe
C:\PROGRA~1\MICROS~2\Office12\OUTLOOK.EXE
C:\Documents and Settings\Windows Xp\Documenti\Programmi Robert\HijackThis.exe
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.libero.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
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: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: Groove GFS Browser Helper - {72853161-30C5-4D22-B7F9-0BBC1D38A37E} - C:\PROGRA~1\MICROS~2\Office12\GRA8E1~1.DLL
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Programmi\Java\jre1.6.0\bin\ssv.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: Windows Live Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Programmi\File comuni\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O4 - HKLM\..\Run: [TrackPointSrv] tp4serv.exe
O4 - HKLM\..\Run: [IgfxTray] C:\WINDOWS\system32\igfxtray.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\system32\hkcmd.exe
O4 - HKLM\..\Run: [Persistence] C:\WINDOWS\system32\igfxpers.exe
O4 - HKLM\..\Run: [SoundMAXPnP] C:\Programmi\Analog Devices\Core\smax4pnp.exe
O4 - HKLM\..\Run: [SoundMAX] C:\Programmi\Analog Devices\SoundMAX\Smax4.exe /tray
O4 - HKLM\..\Run: [TPHOTKEY] C:\Programmi\Lenovo\HOTKEY\TPOSDSVC.exe
O4 - HKLM\..\Run: [NeroFilterCheck] C:\Programmi\File comuni\Ahead\Lib\NeroCheck.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\Java\jre1.6.0\bin\jusched.exe"
O4 - HKLM\..\Run: [TVT Scheduler Proxy] C:\Programmi\File comuni\Lenovo\Scheduler\scheduler_proxy.exe
O4 - HKLM\..\Run: [AVG7_CC] C:\PROGRA~1\Grisoft\AVG7\avgcc.exe /STARTUP
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - Global Startup: Adobe Reader Synchronizer.lnk = C:\Programmi\Adobe\Reader 8.0\Reader\AdobeCollabSync.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office12\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.6.0\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.6.0\bin\ssv.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: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\Office12\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
O11 - Options group: [INTERNATIONAL] International*
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O16 - DPF: {2DAD3559-2923-4935-AD49-B673D2539944} (IASRunner Class) - http://www-307.ibm.com/pc/support/acpir.cab
O18 - Protocol: grooveLocalGWS - {88FED34C-F0CA-4636-A375-3CB6248B04CD} - C:\PROGRA~1\MICROS~2\Office12\GR99D3~1.DLL
O18 - Protocol: livecall - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: ms-help - {314111C7-A502-11D2-BBCA-00C04F8EC294} - C:\Programmi\File comuni\Microsoft Shared\Help\hxds.dll
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Filter hijack: text/xml - {807563E5-5146-11D5-A672-00B0D022E945} - C:\PROGRA~1\FILECO~1\MICROS~1\OFFICE12\MSOXMLMF.DLL
O20 - Winlogon Notify: igfxcui - C:\WINDOWS\SYSTEM32\igfxdev.dll
O20 - Winlogon Notify: tpfnf2 - C:\Programmi\Lenovo\HOTKEY\notifyf2.dll
O20 - Winlogon Notify: tphotkey - C:\Programmi\Lenovo\HOTKEY\tphklock.dll
O21 - SSODL: WPDShServiceObj - {AAA288BA-9A4C-45B0-95D7-94D524869DB5} - C:\WINDOWS\system32\WPDShServiceObj.dll
O23 - Service: Atheros Configuration Service (acs) - Atheros - C:\WINDOWS\system32\acs.exe
O23 - Service: ASP.NET State Service (aspnet_state) - Unknown owner - C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\aspnet_state.exe (file missing)
O23 - Service: AVG7 Alert Manager Server (Avg7Alrt) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
O23 - Service: AVG7 Update Service (Avg7UpdSvc) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
O23 - Service: Intel(R) PROSet/Wireless Event Log (EvtEng) - Intel Corporation - C:\Programmi\Intel\Wireless\Bin\EvtEng.exe
O23 - Service: ThinkPad PM Service (IBMPMSVC) - Lenovo - C:\WINDOWS\system32\ibmpmsvc.exe
O23 - Service: MATLAB Server (matlabserver) - Unknown owner - C:\Programmi\MATLAB7\webserver\bin\win32\matlabserver.exe
O23 - Service: NBService - Nero AG - C:\Programmi\Nero\Nero 7\Nero BackItUp\NBService.exe
O23 - Service: Private Folder Service (prfldsvc) - Unknown owner - C:\Programmi\Microsoft Private Folder 1.0\PrfldSvc.exe
O23 - Service: Intel(R) PROSet/Wireless Registry Service (RegSrvc) - Intel Corporation - C:\Programmi\Intel\Wireless\Bin\RegSrvc.exe
O23 - Service: Intel(R) PROSet/Wireless Service (S24EventMonitor) - Intel Corporation - C:\Programmi\Intel\Wireless\Bin\S24EvMon.exe
O23 - Service: ThinkVantage Registry Monitor Service - Lenovo Group Limited - C:\Programmi\File comuni\Lenovo\tvt_reg_monitor_svc.exe
O23 - Service: TVT Backup Protection Service - Unknown owner - C:\Programmi\Lenovo\Rescue and Recovery\rrpservice.exe
O23 - Service: TVT Backup Service - Lenovo Group Limited - C:\Programmi\Lenovo\Rescue and Recovery\rrservice.exe
O23 - Service: TVT Scheduler - Lenovo Group Limited - C:\Programmi\File comuni\Lenovo\Scheduler\tvtsched.exe
O23 - Service: tvtnetwk - Unknown owner - C:\Programmi\Lenovo\Rescue and Recovery\ADM\IUService.exe
