memoria RAM danneggiata?

[aragorn81]

Ciao a tutti,
da un po' di tempo sto avendo il seguente problema:
accendo il pc normalmente ma quando entro su windows il pc resta bloccato li. Se con il mouse vado sulla barra delle applicazioni compare la clessidra e non mi fa interagire. Ho riavviato il pc in modalità provvisoria e ho notato che il processo bloccato è explorer.exe. Terminando il processo e riavviandolo, sempre in modalità provvisoria, tutto tornava ok. Ho riavviato il pc e ho fatto la stessa cosa. Il pc sembra sbloccarsi ma solo temporaneamente... dopo un po' il processa si riblocca, oppure ad ogni nuova accensione/riavvio si blocca.
Leggendo su Internet ho visto che la cosa può essere correlata ad una RAM danneggiata? E' possibile? (se ho sbagliato sezione chiedo scusa... non sapevo dove inserire la discussione).

Le caratteristiche del pc (vecchiotto) sono le seguenti:
CPU: Intel Core 2 Duo 2GHz
RAM: 512MB
MB: ASUS P5VD2-X
Scheda video: ATI Radeon X1300

Il log di hijackthis è invece:
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 15.39.40, on 03/04/2010
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
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\Ati2evxx.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\Ati2evxx.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\File comuni\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
C:\Programmi\Java\jre6\bin\jqs.exe
C:\Programmi\File comuni\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe
C:\Programmi\Alwil Software\Avast4\ashWebSv.exe
C:\WINDOWS\system32\wbem\wmiapsrv.exe
C:\WINDOWS\RTHDCPL.EXE
C:\Programmi\ATI Technologies\ATI.ACE\CLI.EXE
C:\Programmi\Windows Defender\MSASCui.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\Programmi\Java\jre6\bin\jusched.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\ATI Technologies\ATI.ACE\cli.exe
C:\Programmi\ATI Technologies\ATI.ACE\cli.exe
C:\WINDOWS\system32\taskmgr.exe
C:\WINDOWS\explorer.exe
C:\Programmi\Windows Defender\MsMpEng.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\Programmi\Java\jre6\bin\jucheck.exe
C:\Programmi\Trend Micro\HijackThis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.it/
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: Skype add-on (mastermind) - {22BF413B-C6D2-4d91-82A9-A0F997BA588C} - C:\Programmi\Skype\Toolbars\Internet Explorer\SkypeIEPlugin.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_plugin.dll
O4 - HKLM\..\Run: [RTHDCPL] RTHDCPL.EXE
O4 - HKLM\..\Run: [Alcmtr] ALCMTR.EXE
O4 - HKLM\..\Run: [ATICCC] "C:\Programmi\ATI Technologies\ATI.ACE\CLIStart.exe"
O4 - HKLM\..\Run: [Windows Defender] "C:\Programmi\Windows Defender\MSASCui.exe" -hide
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\Java\jre6\bin\jusched.exe"
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKLM\..\Policies\Explorer\Run: [GT15J4R49V] C:\WINDOWS\cpuserv.exe
O4 - HKLM\..\Policies\Explorer\Run: [some] C:\Programmi\NetProject\scit.exe
O4 - HKLM\..\Policies\Explorer\Run: [start] C:\Programmi\NetProject\sbmntr.exe
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: Webshots.lnk = C:\Programmi\Webshots\Launcher.exe
O4 - Global Startup: Avvio veloce di Adobe Reader.lnk = C:\Programmi\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O9 - Extra button: Inserisci blog - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Programmi\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra 'Tools' menuitem: Inserisci &blog in Windows Live Writer - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Programmi\Windows Live\Writer\WriterBrowserExtension.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: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\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
O16 - DPF: {05CA9FB0-3E3E-4B36-BF41-0E3A5CAA8CD8} (Office Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=58813
O16 - DPF: {20A60F0D-9AFA-4515-A0FD-83BD84642501} (Checkers Class) - http://messenger.zone.msn.com/binary...r.cab56986.cab
O16 - DPF: {4A85DBE0-BFB2-4119-8401-186A7C6EB653} - http://messenger.zone.msn.com/Messen....cab109791.cab
O16 - DPF: {5D6F45B3-9043-443D-A792-115447494D24} (UnoCtrl Class) - http://messenger.zone.msn.com/Messen.../GAME_UNO1.cab
O16 - DPF: {C3F79A2B-B9B4-4A66-B012-3EE46475B072} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary...t.cab56907.cab
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\FILECO~1\Skype\SKYPE4~1.DLL
O22 - SharedTaskScheduler: frowardness - {b0fdc513-46b9-46fc-8e70-d575ee546dae} - (no file)
O23 - Service: Apple Mobile Device - Apple Inc. - C:\Programmi\File comuni\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: ATI Smart - Unknown owner - C:\WINDOWS\system32\ati2sgag.exe
O23 - Service: Autodesk Licensing Service - Autodesk - C:\Programmi\File comuni\Autodesk Shared\Service\AdskScSrv.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: Servizio di Google Update (gupdate1ca4505926c0a2c) (gupdate1ca4505926c0a2c) - Google Inc. - C:\Programmi\Google\Update\GoogleUpdate.exe
O23 - Service: InstallShield Licensing Service - Macrovision - C:\Programmi\File comuni\InstallShield Shared\Service\InstallShield Licensing Service.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

--
End of file - 7031 bytes

sono davvero disperato...
Grazie 1000 in anticipo!