Ciao a tutti!

Da un po' di giorni il pc (Windows XP, Intel Core 2, Ram 2Giga, Processore 2.66GHz) non ne vuole sapere di funzionare. Navigo con Mozilla (versione 3.6.3), e se ho più di una scheda aperta, spesso si blocca il pc e non funzionano nè Task manager, nè ctrl+alt+canc. L'unico modo che ho per sbloccarlo è resettare oppure spegnerlo. Ho provato a cambiare browser, ma succede comunque. La stessa cosa succede anche quando ascolto musica sia da iTunes che da wmp (sia quando navigo che quando sono sconnessa), la canzone si blocca completamente e non riesco più a fare nulla. Inoltre è anche successo che il pc una volta bloccato emetta un suono (beep) continuo. Il mouse in tutte queste situazioni però rimane attivo e si muove regolarmente.
Ultima cosa, all'avvio mi appare sempre un errore "rthdcpl.exe" relativo credo alla scheda audio (Realtek HD Audio Control Panel).

Mi hanno consigliato di usare Hijackthis ma non so intepretare il risultato. Vi sarei grata se qualcuno mi aiutasse a capire. Vi servono altre informazioni?

Grazie mille!!

Ecco il log:

Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 18.32.51, on 10/06/2010
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.17023)
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:\Programmi\Panda Security\Panda Global Protection 2009\TPSrv.exe
C:\PROGRAMMI\PANDA SECURITY\PANDA GLOBAL PROTECTION 2009\WebProxy.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\File comuni\Apple\Mobile Device Support\AppleMobileDeviceService.exe
C:\Programmi\Bonjour\mDNSResponder.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Java\jre6\bin\jqs.exe
C:\Programmi\File comuni\LightScribe\LSSrvc.exe
C:\Programmi\Nero\Nero8\Nero BackItUp\NBService.exe
C:\Programmi\Panda Security\Panda Global Protection 2009\PsCtrls.exe
C:\Programmi\Panda Security\Panda Global Protection 2009\PavFnSvr.exe
C:\Programmi\File comuni\Panda Security\PavShld\pavprsrv.exe
C:\Programmi\Panda Security\Panda Global Protection 2009\pavsrv51.exe
C:\WINDOWS\system32\IoctlSvc.exe
C:\Programmi\Panda Security\Panda Global Protection 2009\psimsvc.exe
C:\Programmi\Panda Security\Panda Global Protection 2009\AVENGINE.EXE
C:\Programmi\Panda Security\Panda Global Protection 2009\PskSvc.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\wuauclt.exe
c:\programmi\panda security\panda global protection 2009\firewall\PSHOST.EXE
C:\WINDOWS\Explorer.EXE
C:\Programmi\Panda Security\Panda Global Protection 2009\ApvxdWin.exe
C:\WINDOWS\system32\RunDLL32.exe
C:\Programmi\File comuni\Nikon\Monitor\NkMonitor.exe
C:\Programmi\File comuni\Java\Java Update\jusched.exe
C:\Programmi\Adobe\Reader 8.0\Reader\Reader_sl.exe
C:\Programmi\iTunes\iTunesHelper.exe
C:\Programmi\Panda Security\Panda Global Protection 2009\SRVLOAD.EXE
C:\WINDOWS\system32\wbem\wmiapsrv.exe
C:\Programmi\iPod\bin\iPodService.exe
C:\Documents and Settings\Pc\Desktop\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://it.yahoo.com/
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\Windows\CurrentVersion\Int ernet Settings,ProxyOverride = *.local
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: RealPlayer Download and Record Plugin for Internet Explorer - {3049C3E9-B461-4BC5-8870-4C09146192CA} - C:\Program Files\Real\RealPlayer\rpbrowserrecordplugin.dll
O2 - BHO: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
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_plugi n.dll
O4 - HKLM\..\Run: [RTHDCPL] RTHDCPL.EXE
O4 - HKLM\..\Run: [Alcmtr] ALCMTR.EXE
O4 - HKLM\..\Run: [EPSON Stylus D68 Series] C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_FATIA AE.EXE /P23 "EPSON Stylus D68 Series" /O6 "USB001" /M "Stylus D68"
O4 - HKLM\..\Run: [PD0620 STISvc] RunDLL32.exe P0620Pin.dll,RunDLL32EP 513
O4 - HKLM\..\Run: [APVXDWIN] "C:\Programmi\Panda Security\Panda Global Protection 2009\APVXDWIN.EXE" /s
O4 - HKLM\..\Run: [SCANINICIO] "C:\Programmi\Panda Security\Panda Global Protection 2009\Inicio.exe"
O4 - HKLM\..\Run: [Nikon Transfer Monitor] C:\Programmi\File comuni\Nikon\Monitor\NkMonitor.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\File comuni\Java\Java Update\jusched.exe"
O4 - HKLM\..\Run: [Adobe ARM] "C:\Programmi\File comuni\Adobe\ARM\1.0\AdobeARM.exe"
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Programmi\Adobe\Reader 8.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\QTTask.exe" -atboottime
O4 - HKLM\..\Run: [iTunesHelper] "C:\Programmi\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [NBKeyScan] "C:\Programmi\Nero\Nero8\Nero BackItUp\NBKeyScan.exe"
O4 - HKCU\..\Run: [MsnMsgr] "C:\Programmi\Windows Live\Messenger\MsnMsgr.Exe" /background
O4 - HKCU\..\Run: [Google Update] "C:\Documents and Settings\Pc\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')
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
O16 - DPF: {7FC1B346-83E6-4774-8D20-1A6B09B0E737} (Windows Live Photo Upload Control) - http://elenitaspagnolita.spaces.live...d/MsnPUpld.cab
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\FILECO~1\Skype\SKYPE4~1.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: Servicio Bonjour (Bonjour Service) - Apple Inc. - C:\Programmi\Bonjour\mDNSResponder.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programmi\File comuni\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: Servicio del 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: LightScribeService Direct Disc Labeling Service (LightScribeService) - Hewlett-Packard Company - C:\Programmi\File comuni\LightScribe\LSSrvc.exe
O23 - Service: Nero BackItUp Scheduler 3 - Nero AG - C:\Programmi\Nero\Nero8\Nero BackItUp\NBService.exe
O23 - Service: NMIndexingService - Nero AG - C:\Programmi\File comuni\Nero\Lib\NMIndexingService.exe
O23 - Service: Panda Software Controller - Panda Security, S.L. - C:\Programmi\Panda Security\Panda Global Protection 2009\PsCtrls.exe
O23 - Service: Panda Function Service (PAVFNSVR) - Unknown owner - C:\Programmi\Panda Security\Panda Global Protection 2009\PavFnSvr.exe
O23 - Service: Panda Process Protection Service (PavPrSrv) - Unknown owner - C:\Programmi\File comuni\Panda Security\PavShld\pavprsrv.exe
O23 - Service: Panda anti-virus service (PAVSRV) - Panda Security, S.L. - C:\Programmi\Panda Security\Panda Global Protection 2009\pavsrv51.exe
O23 - Service: PLFlash DeviceIoControl Service - Prolific Technology Inc. - C:\WINDOWS\system32\IoctlSvc.exe
O23 - Service: Panda Host Service (PSHost) - Unknown owner - c:\programmi\panda security\panda global protection 2009\firewall\PSHOST.EXE
O23 - Service: Panda IManager Service (PSIMSVC) - Panda Security S.L. - C:\Programmi\Panda Security\Panda Global Protection 2009\psimsvc.exe
O23 - Service: Panda PSK service (PskSvcRetail) - Panda Security, S.L. - C:\Programmi\Panda Security\Panda Global Protection 2009\PskSvc.exe
O23 - Service: Panda TPSrv (TPSrv) - Panda Security, S.L. - C:\Programmi\Panda Security\Panda Global Protection 2009\TPSrv.exe