Dopo aver provato ubuntu in modalità live riscontro un notevole rallentamento in special modo nell'apertura dei programmi.
Questo il log:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 16.01.56, on 06/07/2009
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:\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\spoolsv.exe
C:\Programmi\Creative\SBAudigy2ZS\Surround Mixer\CTSysVol.exe
C:\Programmi\Creative\SBAudigy2ZS\DVDAudio\CTDVDDet.EXE
C:\WINDOWS\system32\CTHELPER.EXE
C:\Programmi\ATI Technologies\ATI Control Panel\atiptaxx.exe
C:\WINDOWS\system32\LVCOMSX.EXE
C:\Programmi\Microsoft Office\Office12\GrooveMonitor.exe
C:\Programmi\Pinnacle\PCTV Stereo\Remote\Remoterm.exe
C:\WINDOWS\system32\rundll32.exe
C:\Programmi\File comuni\InstallShield\UpdateService\issch.exe
C:\Programmi\Panda USB Vaccine\USBVaccine.exe
C:\Programmi\Samsung\EmoDio\SMSTray.exe
C:\Programmi\Java\jre6\bin\jusched.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\Programmi\PC Tools Firewall Plus\FirewallGUI.exe
C:\Programmi\Spyware Terminator\SpywareTerminatorShield.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Creative\MediaSource\RemoteControl\RCMan.EXE
C:\Programmi\filehippo.com\UpdateChecker.exe
C:\PROGRA~1\Nero\Nero PhotoShow 4\data\xtras\mssysmgr.exe
C:\Programmi\Spyware Terminator\SpywareTerminatorUpdate.exe
C:\WINDOWS\system32\CTsvcCDA.exe
C:\WINDOWS\System32\svchost.exe
C:\Programmi\Pinnacle\Shared Files\Programs\Scheduler\PCLEScheduler.exe
C:\Programmi\Java\jre6\bin\jqs.exe
C:\Programmi\Fastweb\PrintAndFax\FaxMonitor.exe
C:\Programmi\CDBurnerXP\NMSAccessU.exe
C:\Programmi\PC Tools Firewall Plus\FWService.exe
C:\Programmi\rnamfler\naofsvc.exe
C:\Programmi\Spyware Terminator\sp_rsser.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\MsPMSPSv.exe
C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe
C:\Programmi\Alwil Software\Avast4\ashWebSv.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 Explorer\SearchURL,(Default) = http://www.speedapps.com/search.htm
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: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Programmi\File comuni\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: Skype add-on (mastermind) - {22BF413B-C6D2-4d91-82A9-A0F997BA588C} - C:\Programmi\Skype\Toolbars\Internet Explorer\SkypeIEPlugin.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 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
O4 - HKLM\..\Run: [CTSysVol] C:\Programmi\Creative\SBAudigy2ZS\Surround Mixer\CTSysVol.exe /r
O4 - HKLM\..\Run: [CTDVDDET] C:\Programmi\Creative\SBAudigy2ZS\DVDAudio\CTDVDDet.EXE
O4 - HKLM\..\Run: [CTHelper] CTHELPER.EXE
O4 - HKLM\..\Run: [SBDrvDet] C:\Programmi\Creative\SB Drive Det\SBDrvDet.exe /r
O4 - HKLM\..\Run: [UpdReg] C:\WINDOWS\UpdReg.EXE
O4 - HKLM\..\Run: [ATIPTA] C:\Programmi\ATI Technologies\ATI Control Panel\atiptaxx.exe
O4 - HKLM\..\Run: [LVCOMSX] C:\WINDOWS\system32\LVCOMSX.EXE
O4 - HKLM\..\Run: [GrooveMonitor] "C:\Programmi\Microsoft Office\Office12\GrooveMonitor.exe"
O4 - HKLM\..\Run: [PCTVRemote] C:\Programmi\Pinnacle\PCTV Stereo\Remote\Remoterm.exe
O4 - HKLM\..\Run: [BluetoothAuthenticationAgent] rundll32.exe bthprops.cpl,,BluetoothAuthenticationAgent
O4 - HKLM\..\Run: [ISUSScheduler] "C:\Programmi\File comuni\InstallShield\UpdateService\issch.exe" -start
O4 - HKLM\..\Run: [ISUSPM Startup] c:\PROGRA~1\FILECO~1\INSTAL~1\updateservice\isuspm.exe -startup
O4 - HKLM\..\Run: [SMSTray] C:\Programmi\Samsung\EmoDio\SMSTray.exe
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Programmi\Adobe\Reader 9.0\Reader\Reader_sl.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: [00PCTFW] "C:\Programmi\PC Tools Firewall Plus\FirewallGUI.exe" -s
O4 - HKLM\..\Run: [SpywareTerminator] "C:\Programmi\Spyware Terminator\SpywareTerminatorShield.exe"
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [RemoteCenter] C:\Programmi\Creative\MediaSource\RemoteControl\RCMan.EXE
O4 - HKCU\..\Run: [filehippo.com] "C:\Programmi\filehippo.com\UpdateChecker.exe" /background
O4 - HKCU\..\Run: [Nero PhotoShow Media Manager] C:\PROGRA~1\Nero\Nero PhotoShow 4\data\xtras\mssysmgr.exe
O4 - HKCU\..\Run: [SpywareTerminatorUpdate] "C:\Programmi\Spyware Terminator\SpywareTerminatorUpdate.exe"
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\S-1-5-18\..\RunOnce: [nltide_3] rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,C,,4,N (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - HKUS\.DEFAULT\..\RunOnce: [nltide_3] rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,C,,4,N (User 'Default user')
O4 - Startup: Ritaglio schermata e avvio di OneNote 2007.lnk = C:\Programmi\Microsoft Office\Office12\ONENOTEM.EXE
O4 - Startup: VCM.lnk = C:\Programmi\VCM\cm.exe
O4 - Global Startup: Pinnacle Scheduler.lnk = ?
O4 - Global Startup: PrintAndFax.lnk = C:\Programmi\Fastweb\PrintAndFax\FaxMonitor.exe
O8 - Extra context menu item: &Clean Traces - C:\Programmi\DAP\Privacy Package\dapcleanerie.htm
O8 - Extra context menu item: &Download with &DAP - C:\Programmi\DAP\dapextie.htm
O8 - Extra context menu item: Add to Local Website Archive - C:\Documents and Settings\agostino\Dati applicazioni\aignes\Local Website Archive\config\iearc.htm
O8 - Extra context menu item: Download &all with DAP - C:\Programmi\DAP\dapextie2.htm
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~1\Office12\EXCEL.EXE/3000
O8 - Extra context menu item: Scarica con Download &Express - C:\Programmi\Download Express\Add_Url.htm
O9 - Extra button: Invia a OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~1\Office12\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: I&nvia a OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~1\Office12\ONBttnIE.dll
O9 - Extra button: (no name) - {5067A26B-1337-4436-8AFE-EE169C2DA79F} - C:\Programmi\Skype\Toolbars\Internet Explorer\SkypeIEPlugin.dll
O9 - Extra 'Tools' menuitem: Skype add-on for Internet Explorer - {5067A26B-1337-4436-8AFE-EE169C2DA79F} - C:\Programmi\Skype\Toolbars\Internet Explorer\SkypeIEPlugin.dll
O9 - Extra button: Skype - {77BF5300-1474-4EC7-9980-D32B190E9B07} - C:\Programmi\Skype\Toolbars\Internet Explorer\SkypeIEPlugin.dll
O9 - Extra button: (no name) - {85d1f590-48f4-11d9-9669-0800200c9a66} - C:\WINDOWS\bdoscandel.exe
O9 - Extra 'Tools' menuitem: Uninstall BitDefender Online Scanner - {85d1f590-48f4-11d9-9669-0800200c9a66} - C:\WINDOWS\bdoscandel.exe
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~1\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:\WINDOWS\system32\shdocvw.dll
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\WINDOWS\system32\shdocvw.dll
O9 - Extra button: (no name) - {1FFF3455-713D-4141-A2A5-896D4691AC5C} - C:\Programmi\Local Website Archive\wsarc_add.exe (HKCU)
O9 - Extra 'Tools' menuitem: Add to Local Website Archive - {1FFF3455-713D-4141-A2A5-896D4691AC5C} - C:\Programmi\Local Website Archive\wsarc_add.exe (HKCU)
O9 - Extra button: Start Local Website Archive - {40A024CA-8EF2-4475-B0AB-20FB7092A14A} - C:\Programmi\Local Website Archive\wsarc.exe (HKCU)
O9 - Extra button: Add to Local Website Archive - {A9BAE3D6-0728-466E-9576-995870AA9061} - C:\Programmi\Local Website Archive\wsarc_add.exe (HKCU)
O16 - DPF: {5D86DDB5-BDF9-441B-9E9E-D4730F4EE499} (BDSCANONLINE Control) - http://download.bitdefender.com/resources/scanner/sources/en/scan8/oscan8.cab
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: a-squared Free Service (a2free) - Unknown owner - C:\Programmi\a-squared Free\a2service.exe (file missing)
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: ATI Smart - Unknown owner - C:\WINDOWS\system32\ati2sgag.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: Creative Service for CDROM Access - Creative Technology Ltd - C:\WINDOWS\system32\CTsvcCDA.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Programmi\Java\jre6\bin\jqs.exe
O23 - Service: Lavasoft Ad-Aware Service - Unknown owner - C:\Programmi\Lavasoft\Ad-Aware\AAWService.exe (file missing)
O23 - Service: NMSAccessU - Unknown owner - C:\Programmi\CDBurnerXP\NMSAccessU.exe
O23 - Service: PC Tools Firewall Plus (PCToolsFirewallPlus) - PC Tools - C:\Programmi\PC Tools Firewall Plus\FWService.exe
O23 - Service: RdnaoFlSvc - Unknown owner - C:\Programmi\rnamfler\naofsvc.exe
O23 - Service: Spyware Terminator Realtime Shield Service (sp_rssrv) - Crawler.com - C:\Programmi\Spyware Terminator\sp_rsser.exe

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End of file - 11049 bytes

Ringrazio anticipatamente e salutoni a tutti.

Il lg è pulito, io ti consiglio di togliere qualche programma dall'avvio automatico. Ne hai una trentina..
Elimina queste righe:

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O4 - HKLM\..\Run: [GrooveMonitor] "C:\Programmi\Microsoft Office\Office12\GrooveMonitor.exe"
O4 - HKLM\..\Run: [PCTVRemote] C:\Programmi\Pinnacle\PCTV Stereo\Remote\Remoterm.exe
O4 - HKLM\..\Run: [BluetoothAuthenticationAgent] rundll32.exe bthprops.cpl,,BluetoothAuthenticationAgent
O4 - HKLM\..\Run: [ISUSScheduler] "C:\Programmi\File comuni\InstallShield\UpdateService\issch.exe" -start
O4 - HKLM\..\Run: [SMSTray] C:\Programmi\Samsung\EmoDio\SMSTray.exe
O4 - HKCU\..\Run: [Nero PhotoShow Media Manager] C:\PROGRA~1\Nero\Nero PhotoShow 4\data\xtras\mssysmgr.exe
O4 - Startup: Ritaglio schermata e avvio di OneNote 2007.lnk = C:\Programmi\Microsoft Office\Office12\ONENOTEM.EXE
O4 - Startup: VCM.lnk = C:\Programmi\VCM\cm.exe

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e poi fai una deframmentazione.

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