Da qualche tempo il PC è lento, a volte le finestre rimangono "trasparenti" a lungo lasciando vedere il desktop sottostante, a volte si piazza la clessidra che continua a girare senza che io abbia fatto alcunchè e in questi casi l'utilizzo della CPU è al 100% anche se non vi sono applicazioni aperte e infine il mouse sembra impazzito... al semplice clic apre la stessa finestra o lo stesso file anche 3/4 volte e, inoltre mi è difficile selezionare o salvare/copiare/tagliare.
Dopo aver fatto pulizia con Ccleaner, scansione con SpyBot e con l'antivirus McAfee, vi chiedo di gentilmente dare un'occhiata al log

Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 10.26.58, on 07/12/2011
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\Explorer.EXE
C:\WINDOWS\system32\brsvc01a.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\brss01a.exe
C:\Programmi\Bonjour\mDNSResponder.exe
C:\WINDOWS\system32\crypserv.exe
C:\Programmi\Java\jre6\bin\jqs.exe
C:\Programmi\File comuni\Mcafee\McSvcHost\McSvHost.exe
C:\WINDOWS\system32\mfevtps.exe
C:\Programmi\Nero\Nero8\Nero BackItUp\NBService.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Hamlet\Adsl\dslstat.exe
C:\Program Files\Hamlet\Adsl\dslagent.exe
C:\Programmi\McAfee.com\Agent\mcagent.exe
C:\Programmi\Norton Ghost\Agent\VProTray.exe
C:\programmi\real\realplayer\update\realsched.exe
C:\Programmi\iTunes\iTunesHelper.exe
C:\Programmi\Nitro PDF\Reader 2\NitroPDFReaderDriverService2.exe
C:\Programmi\ScanSoft\TextBridgePro11.0\opware32.exe
C:\Programmi\Norton Ghost\Agent\VProSvc.exe
C:\Programmi\Messenger\msmsgs.exe
C:\WINDOWS\system32\IoctlSvc.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\dllhost.exe
C:\Programmi\Logitech\SetPoint\SetPoint.exe
C:\Programmi\File comuni\McAfee\SystemCore\mcshield.exe
C:\Programmi\Verbatim GREEN BUTTON\GREEN BUTTON.exe
C:\Programmi\File comuni\McAfee\SystemCore\mfefire.exe
C:\Programmi\File comuni\Logishrd\KHAL2\KHALMNPR.EXE
C:\WINDOWS\system32\dllhost.exe
C:\WINDOWS\system32\rundll32.exe
C:\Programmi\Norton Ghost\Shared\Drivers\SymSnapService.exe
C:\Programmi\iPod\bin\iPodService.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\Programmi\Mozilla Firefox\plugin-container.exe
C:\Programmi\Mozilla Firefox\plugin-container.exe
C:\WINDOWS\system32\NOTEPAD.EXE
C:\PROGRA~1\MOBILE~1\bin\DESPROXY.exe
C:\PROGRA~1\MOBILE~1\bin\SPHONE~1.EXE
C:\Programmi\Trend Micro\HiJackThis\HiJackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
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 Connection Wizard,ShellNext = wmplayer.exe //ICWLaunch
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
R3 - URLSearchHook: McAfee SiteAdvisor Toolbar - {0EBBBE48-BAD4-4B4C-8E5A-516ABECAE064} - c:\PROGRA~1\mcafee\SITEAD~1\mcieplg.dll
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.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: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: scriptproxy - {7DB2D5A0-7241-4E79-B68D-6309F01C5231} - C:\Programmi\File comuni\McAfee\SystemCore\ScriptSn.20111123081852.dll
O2 - BHO: Guida per l'accesso a Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Programmi\File comuni\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: McAfee SiteAdvisor BHO - {B164E929-A1B6-4A06-B104-2CD0E90A88FF} - c:\PROGRA~1\mcafee\SITEAD~1\mcieplg.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
O3 - Toolbar: McAfee SiteAdvisor Toolbar - {0EBBBE48-BAD4-4B4C-8E5A-516ABECAE064} - c:\PROGRA~1\mcafee\SITEAD~1\mcieplg.dll
O4 - HKLM\..\Run: [DSLSTATEXE] C:\Program Files\Hamlet\Adsl\dslstat.exe icon
O4 - HKLM\..\Run: [DSLAGENTEXE] C:\Program Files\Hamlet\Adsl\dslagent.exe
O4 - HKLM\..\Run: [mcui_exe] "C:\Programmi\McAfee.com\Agent\mcagent.exe" /runkey
O4 - HKLM\..\Run: [Norton Ghost 14.0] "C:\Programmi\Norton Ghost\Agent\VProTray.exe"
O4 - HKLM\..\Run: [TkBellExe] "C:\programmi\real\realplayer\update\realsched.exe" -osboot
O4 - HKLM\..\Run: [Kernel and Hardware Abstraction Layer] KHALMNPR.EXE
O4 - HKLM\..\Run: [NBKeyScan] "C:\Programmi\Nero\Nero8\Nero BackItUp\NBKeyScan.exe"
O4 - HKLM\..\Run: [NeroFilterCheck] C:\Programmi\File comuni\Nero\Lib\NeroCheck.exe
O4 - HKLM\..\Run: [BluetoothAuthenticationAgent] rundll32.exe bthprops.cpl,,BluetoothAuthenticationAgent
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [iTunesHelper] "C:\Programmi\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [Omnipage] C:\Programmi\ScanSoft\TextBridgePro11.0\opware32.exe
O4 - HKLM\..\Run: [TextBridge Pro 11.0 Si rammenta di effettuare la registrazione] "C:\Programmi\ScanSoft\TextBridgePro11.0\\EregIta\Ereg.exe" -r "C:\Programmi\ScanSoft\TextBridgePro11.0\\EregIta\Ereg.ini"
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [TClockEx] C:\Programmi\TClockEx\TCLOCKEX.EXE
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [Google Update] "C:\Documents and Settings\Lauretta\Impostazioni locali\Dati applicazioni\Google\Update\GoogleUpdate.exe" /c
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: Verbatim GREEN BUTTON.lnk = C:\Programmi\Verbatim GREEN BUTTON\GREEN BUTTON.exe
O4 - Global Startup: Logitech SetPoint.lnk = C:\Programmi\Logitech\SetPoint\SetPoint.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
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: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: (no name) - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search & Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.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:\Programmi\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O17 - HKLM\System\CCS\Services\Tcpip\..\{3395910B-8BC7-40BB-80B4-649EF72FD55B}: NameServer = 193.70.152.15 212.52.97.15
O18 - Protocol: dssrequest - {5513F07E-936B-4E52-9B00-067394E91CC5} - c:\PROGRA~1\mcafee\SITEAD~1\mcieplg.dll
O18 - Protocol: sacore - {5513F07E-936B-4E52-9B00-067394E91CC5} - c:\PROGRA~1\mcafee\SITEAD~1\mcieplg.dll
O18 - Filter: application/x-mfe-ipt - {3EF5086B-5478-4598-A054-786C45D75692} - c:\progra~1\mcafee\msc\mcsniepl.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: 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: BrSplService (Brother XP spl Service) - brother Industries Ltd - C:\WINDOWS\system32\brsvc01a.exe
O23 - Service: Crypkey License - CrypKey (Canada) Ltd. - C:\WINDOWS\SYSTEM32\crypserv.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: Logitech Bluetooth Service (LBTServ) - Logitech, Inc. - C:\Programmi\File comuni\Logitech\Bluetooth\LBTServ.exe
O23 - Service: McAfee SiteAdvisor Service - McAfee, Inc. - C:\Programmi\File comuni\Mcafee\McSvcHost\McSvHost.exe
O23 - Service: McAfee Personal Firewall Service (McMPFSvc) - McAfee, Inc. - C:\Programmi\File comuni\Mcafee\McSvcHost\McSvHost.exe
O23 - Service: McAfee Services (mcmscsvc) - McAfee, Inc. - C:\Programmi\File comuni\Mcafee\McSvcHost\McSvHost.exe
O23 - Service: McAfee VirusScan Announcer (McNaiAnn) - McAfee, Inc. - C:\Programmi\File comuni\Mcafee\McSvcHost\McSvHost.exe
O23 - Service: McAfee Network Agent (McNASvc) - McAfee, Inc. - C:\Programmi\File comuni\Mcafee\McSvcHost\McSvHost.exe
O23 - Service: McAfee Scanner (McODS) - McAfee, Inc. - C:\Programmi\McAfee\VirusScan\mcods.exe
O23 - Service: McAfee Proxy Service (McProxy) - McAfee, Inc. - C:\Programmi\File comuni\Mcafee\McSvcHost\McSvHost.exe
O23 - Service: McAfee McShield (McShield) - McAfee, Inc. - C:\Programmi\File comuni\McAfee\SystemCore\\mcshield.exe
O23 - Service: McAfee Firewall Core Service (mfefire) - McAfee, Inc. - C:\Programmi\File comuni\McAfee\SystemCore\\mfefire.exe
O23 - Service: McAfee Validation Trust Protection Service (mfevtp) - McAfee, Inc. - C:\WINDOWS\system32\mfevtps.exe
O23 - Service: Nero BackItUp Scheduler 3 - Nero AG - C:\Programmi\Nero\Nero8\Nero BackItUp\NBService.exe
O23 - Service: NitroPDFReaderDriverCreatorReadSpool2 (NitroReaderDriverReadSpool2) - Nitro PDF Software - C:\Programmi\Nitro PDF\Reader 2\NitroPDFReaderDriverService2.exe
O23 - Service: NMIndexingService - Nero AG - C:\Programmi\File comuni\Nero\Lib\NMIndexingService.exe
O23 - Service: Norton Ghost - Symantec Corporation - C:\Programmi\Norton Ghost\Agent\VProSvc.exe
O23 - Service: PLFlash DeviceIoControl Service - Prolific Technology Inc. - C:\WINDOWS\system32\IoctlSvc.exe
O23 - Service: SymSnapService - Symantec - C:\Programmi\Norton Ghost\Shared\Drivers\SymSnapService.exe

--
End of file - 11142 bytes


Ringrazio e auguro buona giornata

Il log non presenta problemi, secondo me hai troppi programmi e diversi mi sembrano inutili, dimmi se conosci
questi e se li hai installati tu:

C:\Programmi\ScanSoft\TextBridgePro11.0\opware32.exe
C:\WINDOWS\system32\IoctlSvc.exe
C:\Programmi\Verbatim GREEN BUTTON\GREEN BUTTON.exe
Se non li conosci o non ti servono rimuovili.
Installa QUESTO programm, lo aggiorni e fai una scansione COMPLETA non veloce, elimina quello che trova, posta il log

Poi con chiusi tutti i programmi e disconnesso, fixa ed elimina queste voci:
O4 - HKLM\..\Run: [Norton Ghost 14.0] "C:\Programmi\Norton Ghost\Agent\VProTray.exe"
O4 - HKLM\..\Run: [TkBellExe] "C:\programmi\real\realplayer\update\realsched.exe" -osboot
O4 - HKLM\..\Run: [Kernel and Hardware Abstraction Layer] KHALMNPR.EXE
O4 - HKLM\..\Run: [NBKeyScan] "C:\Programmi\Nero\Nero8\Nero BackItUp\NBKeyScan.exe"
O4 - HKLM\..\Run: [NeroFilterCheck] C:\Programmi\File comuni\Nero\Lib\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: [Omnipage] C:\Programmi\ScanSoft\TextBridgePro11.0\opware32.exe
O4 - HKLM..Run: [TextBridge Pro 11.0 Si rammenta di effettuare la registrazione] "C:ProgrammiScanSoftTextBridgePro11.0\EregItaEreg.exe" -r "C:ProgrammiScanSoftTextBridgePro11.0\EregItaEreg.ini"
O4 - HKCU\..\Run: [TClockEx] C:\Programmi\TClockEx\TCLOCKEX.EXE
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [Google Update] "C:\Documents and Settings\Lauretta\Impostazioni locali\Dati applicazioni\Google\Update\GoogleUpdate.exe" /c
O4 - Startup: Verbatim GREEN BUTTON.lnk = C:\Programmi\Verbatim GREEN BUTTON\GREEN BUTTON.exe
O4 - Global Startup: Logitech SetPoint.lnk = C:\Programmi\Logitech\SetPoint\SetPoint.exe
Tutte queste voci disattivano l'avvio automatico senza toccare i programmi, quindi velocizzao l'apertura.
Fai una pulizia con Ccleaner compreso il Registro, per il Registro spunta tutte le voci,
Poi usa QUESTO sw, corregge diversi errori di windows.
Fai sapere come va il pc. Ciao

I programmi TextBridgePro e GREEN BUTTON li puoi lasciare mentre IoctlSvc.exe prova a cercarlo in installazione applicazioni, se non c'è vai in start cerca e digita la voce se trova qualcosa elimina.
Anche la voce in avvio se utile lasciala pure.
Questa voce [BluetoothAuthenticationAgent] dovrebbe riguardare un Bluetooth della Logitech, quindi ok
L'altra è regolare quindi lasciale pure.
Per il resto il log è pulito.
Rifai una pulizia con Ccleaner compreso il Registro, per il registro spunta tutte le voci.
Poi vai in C:\windows, cerca la cartella Prefetch e la svuoti completamente, lascia la cartella.
Come antivirus usi McAfee ed anche il firewall ?
Fammi sapere, ciao.