chiedo cortesemente di analizzare il log che allego,
sistema operativo: vista

ringrazio della cortesia.
Ugo

Logfile of Trend Micro HijackThis v2.0.3 (BETA)
Scan saved at 19.36.29, on 27/10/2010
Platform: Windows Vista SP2 (WinNT 6.00.1906)
MSIE: Internet Explorer v8.00 (8.00.6001.18975)
Boot mode: Normal

Running processes:
C:\Windows\system32\Dwm.exe
C:\Windows\Explorer.EXE
C:\Program Files\Windows Defender\MSASCui.exe
C:\Program Files\Synaptics\SynTP\SynTPStart.exe
C:\Windows\System32\hkcmd.exe
C:\Windows\System32\igfxpers.exe
C:\Program Files\Intel\Intel Matrix Storage Manager\IAAnotif.exe
C:\Program Files\CyberLink\Shared files\brs.exe
C:\Program Files\CyberLink\PowerDVD\PDVDServ.exe
C:\Windows\VM303_STI.EXE
C:\Program Files\Common Files\Java\Java Update\jusched.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\Program Files\Common Files\Ahead\Lib\NMBgMonitor.exe
C:\Windows\system32\taskeng.exe
C:\Windows\system32\igfxsrvc.exe
C:\Program Files\Common Files\Ahead\Lib\NMIndexStoreSvr.exe
C:\Windows\System32\mobsync.exe
C:\Program Files\TrendMicro\HiJackThis\HiJackThis.exe
C:\Windows\system32\DllHost.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
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O1 - Hosts: ::1 localhost
O2 - BHO: SuggestMeYesBHO - {0FB6A909-6086-458F-BD92-1F8EE10042A0} - C:\Program Files\AutocompletePro\AutocompletePro.dll
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: IEVkbdBHO - {59273AB4-E7D3-40F9-A1A8-6FA9CCA1862C} - C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 2011\ievkbd.dll
O2 - BHO: Search Helper - {6EBF7485-159F-4bff-A14F-B9E3AAC4465B} - C:\Program Files\Microsoft\Search Enhancement Pack\Search Helper\SEPsearchhelperie.dll
O2 - BHO: Windows Live ID Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre6\bin\jp2ssv.dll
O2 - BHO: link filter bho - {E33CF602-D945-461A-83F0-819F76A199F8} - C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 2011\klwtbbho.dll
O4 - HKLM\..\Run: [Windows Defender] %ProgramFiles%\Windows Defender\MSASCui.exe -hide
O4 - HKLM\..\Run: [SynTPStart] C:\Program Files\Synaptics\SynTP\SynTPStart.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: [IAAnotif] C:\Program Files\Intel\Intel Matrix Storage Manager\iaanotif.exe
O4 - HKLM\..\Run: [NeroFilterCheck] C:\Program Files\Common Files\Ahead\Lib\NeroCheck.exe
O4 - HKLM\..\Run: [BDRegion] C:\Program Files\Cyberlink\Shared Files\brs.exe
O4 - HKLM\..\Run: [RemoteControl] "C:\Program Files\CyberLink\PowerDVD\PDVDServ.exe"
O4 - HKLM\..\Run: [LanguageShortcut] "C:\Program Files\CyberLink\PowerDVD\Language\Language.exe"
O4 - HKLM\..\Run: [AppleSyncNotifier] C:\Program Files\Common Files\Apple\Mobile Device Support\AppleSyncNotifier.exe
O4 - HKLM\..\Run: [BigDog303] C:\Windows\VM303_STI.EXE VIMICRO USB PC Camera (VC0303)
O4 - HKLM\..\Run: [Nokia FastStart] "C:\Program Files\Nokia\Nokia Music\NokiaMusic.exe" /command:faststart
O4 - HKLM\..\Run: [TQ566808] "F:\Setup.exe"
O4 - HKLM\..\Run: [AVP] "C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 2011\avp.exe"
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Common Files\Java\Java Update\jusched.exe"
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\QTTask.exe" -atboottime
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Program Files\Adobe\Reader 9.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [Adobe ARM] "C:\Program Files\Common Files\Adobe\ARM\1.0\AdobeARM.exe"
O4 - HKCU\..\Run: [Sidebar] C:\Program Files\Windows Sidebar\sidebar.exe /autoRun
O4 - HKCU\..\Run: [BgMonitor_{79662E04-7C6C-4d9f-84C7-88D8A56B10AA}] "C:\Program Files\Common Files\Ahead\Lib\NMBgMonitor.exe"
O4 - HKCU\..\Run: [RegistryMechanic] C:\Program Files\Registry Mechanic\RMTray.exe /H
O4 - HKCU\..\Run: [Skype] "C:\Program Files\Skype\\Phone\Skype.exe" /nosplash /minimized
O4 - Startup: Utilità controllo supporti di Picture Motion Browser.lnk = C:\Program Files\Sony\Sony Picture Utility\PMBCore\SPUVolumeWatcher.exe
O4 - Global Startup: Bluetooth Manager.lnk = ?
O8 - Extra context menu item: Add to Google Photos Screensa&ver - res://C:\Windows\system32\GPhotos.scr/200
O9 - Extra button: @C:\Program Files\Windows Live\Writer\WindowsLiveWriterShortcuts.dll,-1004 - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Program Files\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra 'Tools' menuitem: @C:\Program Files\Windows Live\Writer\WindowsLiveWriterShortcuts.dll,-1003 - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Program Files\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra button: &Tastiera Virtuale - {4248FE82-7FCB-46AC-B270-339F08212110} - C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 2011\klwtbbho.dll
O9 - Extra button: C&ontrollo URL - {CCF151D8-D089-449F-A5A4-D9909053F20F} - C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 2011\klwtbbho.dll
O13 - Gopher Prefix:
O16 - DPF: {0CCA191D-13A6-4E29-B746-314DEE697D83} (Facebook Photo Uploader 5 Control) - http://upload.facebook.com/controls/2008.10.10_v5.5.8/FacebookPhotoUploader5.cab
O16 - DPF: {3860DD98-0549-4D50-AA72-5D17D200EE10} (Windows Live OneCare safety scanner control) - http://cdn.scan.onecare.live.com/resource/download/scanner/it-it/wlscctrl2.cab
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
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\COMMON~1\Skype\SKYPE4~1.DLL
O18 - Protocol: wlpg - {E43EF6CD-A37A-4A9B-9E6F-83F89B8E6324} - C:\Program Files\Windows Live\Photo Gallery\AlbumDownloadProtocolHandler.dll
O20 - AppInit_DLLs: C:\PROGRA~1\KASPER~1\KASPER~1\mzvkbd3.dll,C:\PROGRA~1\KASPER~1\KASPER~1\kloehk.dll
O22 - SharedTaskScheduler: Component Categories cache daemon - {8C7461EF-2B13-11d2-BE35-3078302C2030} - C:\Windows\system32\browseui.dll
O23 - Service: Agere Modem Call Progress Audio (AgereModemAudio) - Agere Systems - C:\Windows\system32\agrsmsvc.exe
O23 - Service: Apple Mobile Device - Apple Inc. - C:\Program Files\Common Files\Apple\Mobile Device Support\AppleMobileDeviceService.exe
O23 - Service: Servizio Kaspersky Anti-Virus (AVP) - Kaspersky Lab ZAO - C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 2011\avp.exe
O23 - Service: Servizio Bonjour (Bonjour Service) - Apple Inc. - C:\Program Files\Bonjour\mDNSResponder.exe
O23 - Service: Servizio di Google Update (gupdate1c9d15b6d1ad4fa) (gupdate1c9d15b6d1ad4fa) - Google Inc. - C:\Program Files\Google\Update\GoogleUpdate.exe
O23 - Service: Google Updater Service (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: Intel(R) Matrix Storage Event Monitor (IAANTMON) - Intel Corporation - C:\Program Files\Intel\Intel Matrix Storage Manager\IAANTMon.exe
O23 - Service: Servizio iPod (iPod Service) - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: NBService - Nero AG - C:\Program Files\Nero\Nero 7\Nero BackItUp\NBService.exe
O23 - Service: NitroPDFDriverCreatorReadSpool (NitroDriverReadSpool) - Nitro PDF Software - C:\Program Files\Nitro PDF\Professional\NitroPDFDriverService.exe
O23 - Service: NMIndexingService - Nero AG - C:\Program Files\Common Files\Ahead\Lib\NMIndexingService.exe
O23 - Service: Cyberlink RichVideo Service(CRVS) (RichVideo) - Unknown owner - C:\Program Files\CyberLink\Shared files\RichVideo.exe
O23 - Service: Remote Packet Capture Protocol v.0 (experimental) (rpcapd) - CACE Technologies, Inc. - C:\Program Files\WinPcap\rpcapd.exe
O23 - Service: ServiceLayer - Nokia. - C:\Program Files\Nokia\PC Connectivity Solution\ServiceLayer.exe
O23 - Service: TOSHIBA Bluetooth Service - TOSHIBA CORPORATION - C:\Program Files\Toshiba\Bluetooth Toshiba Stack\TosBtSrv.exe

--
End of file - 9216 bytes

Apri HJT in modalità provvisoria e fixa questa voce:
O2 - BHO: SuggestMeYesBHO - {0FB6A909-6086-458F-BD92-1F8EE10042A0} - C:\Program Files\AutocompletePro\AutocompletePro.dll
Poi scarica Malwarebytes lo aggiorni e fai una scansione COMPLETA, non rapida, elimina quello che trova.
Fai sapere come va il PC.

Ciao, fixa ed elimina questa voce che prima non c'era:
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://search.conduit.com?SearchSource=10&ctid=CT2530241
Fai una pulizia con Ccleaner Registro compreso.
Poi vai in C:\Windows cerca la cartella Prefetch, la apri e elimina tutto il contenuto, non eliminare la cartella.
Se non ti serve proprio io eliminerei anche la Toolbar di Softonic.
Il pc è ancora lento?

scusate l'intrusione,ma la cartella prefetch mi sembra che non vada svuotata con vista,se ho detto una cretinata chiedo scusa anticipamente,buona serata

I file con estensione .pf sono i prefetch creati da XP, si replicano ogni volta che si usa un'applicazione, è normale,
anche svuotando la cartella i file si riformeranno sempre.

La svuoti, poi finchè il pc va bene la lasci stare.
Dimmi se il pc è ancora lento.

dunque..
ora è + veloce..
comunque era lento quando andavo in internet..
la deframmentazione la eseguo ogni 2 settimane circa
grazie x la disponibilità
ugo

grazie r16 per la precisazione, avevo letto in qualche sito che svuotarla non dava problemi, devo ammettere che io uso XP e quindi mi sono fidato, mi servirà per un'altra volta.