Cpu 100% con alcuni programmi

[GiulioCesare]

Salve ragazzi, da qualche giorno ho un problema con la cpu, ovvero quando utilizzo alcuni programmi, tipo firefox o msn, la cpu va immediatamente al 100% e di conseguenza il pc diventa lentissimo. Secondo voi da cosa puoò dipendere?
Ho fatto diverse scansioni con antivirus, ma non è stato trovato nulla, inoltre ho eseguito la scansione con hijackthis, anche se non mi sembrano che ci siano processi "malvagi", posto di seguito il log. Grazie a chi vorrà aiutarmi

Logfile of Trend Micro HijackThis v2.0.0 (BETA)
Scan saved at 10.30.29, on 30/03/2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
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:\Programmi\TortoiseSVN\bin\TSVNCache.exe
C:\WINDOWS\system32\netdde.exe
C:\Programmi\AntiVir PersonalEdition Classic\sched.exe
C:\Programmi\AntiVir PersonalEdition Classic\avguard.exe
C:\Programmi\AntiVir PersonalEdition Classic\avgnt.exe
C:\WINDOWS\system32\clipsrv.exe
C:\Programmi\File comuni\Real\Update_OB\realsched.exe
C:\WINDOWS\system32\ctfmon.exe
C:\WINDOWS\system32\sistray.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Documents and Settings\Administrator\Desktop\HiJackThis_v2.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://it.rd.yahoo.com/customize/ie/...arch.yahoo.com
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\Internet Explorer\SearchURL,(Default) = http://it.rd.yahoo.com/customize/ie/...arch.yahoo.com
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyServer = proxy.dev:3128


;<local>
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
R3 - URLSearchHook: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Programmi\Yahoo!\Companion\Installs\cpn0\yt.dll
O2 - BHO: Yahoo! Toolbar Helper - {02478D38-C3F9-4EFB-9B51-7695ECA05670} - C:\Programmi\Yahoo!\Companion\Installs\cpn0\yt.dll
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Programmi\Yahoo!\Companion\Installs\cpn0\yt.dll
O4 - HKLM\..\Run: [SiSPower] Rundll32.exe SiSPower.dll,ModeAgent
O4 - HKLM\..\Run: [avgnt] "C:\Programmi\AntiVir PersonalEdition Classic\avgnt.exe" /min
O4 - HKLM\..\Run: [TkBellExe] "C:\Programmi\File comuni\Real\Update_OB\realsched.exe" -osboot
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.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 - Global Startup: Utility Tray.lnk = C:\WINDOWS\system32\sistray.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~4\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - C:\PROGRA~1\Yahoo!\Common\yhexbmesit.dll
O9 - Extra 'Tools' menuitem: Yahoo! Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - C:\PROGRA~1\Yahoo!\Common\yhexbmesit.dll
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~4\OFFICE11\REFIEBAR.DLL
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O16 - DPF: {1754A1BA-A1DF-4F10-B199-AA55AA1A120F} (InstallerBehaviorFactory Class) - https://signup.msn.com/pages/MsnInstC.cab
O16 - DPF: {30528230-99f7-4bb4-88d8-fa1d4f56a2ab} (YInstStarter Class) - C:\Programmi\Yahoo!\Common\yinsthelper.dll
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) - http://update.microsoft.com/microsof...?1136978439281
O16 - DPF: {A1F2F2CE-06AF-483C-9F12-D3BAA72477D6} (BatchDownloader Class) - http://appdirectory.messenger.msn.co...p/DigWXMSN.cab
O16 - DPF: {A8482EAF-A1F3-4934-AE3F-56EB195A50BF} (DeskUpdate - Activex Control) - http://support.fujitsu-siemens.de/De...pi/activex.cab
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn.com/download/Ms...Downloader.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{005D6D48-FCA6-475A-84A0-F660A7290192}: NameServer = 208.67.222.222,208.67.220.220
O17 - HKLM\System\CS1\Services\Tcpip\..\{005D6D48-FCA6-475A-84A0-F660A7290192}: NameServer = 208.67.222.222,208.67.220.220
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: AntiVir Scheduler (AntiVirScheduler) - Avira GmbH - C:\Programmi\AntiVir PersonalEdition Classic\sched.exe
O23 - Service: AntiVir PersonalEdition Classic Service (AntiVirService) - AVIRA GmbH - C:\Programmi\AntiVir PersonalEdition Classic\avguard.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programmi\File comuni\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: Ethernet Packet Service (npacketservice) - Nokia - C:\WINDOWS\system32\npacketsvc.exe
O23 - Service: Oracleoracle_eyeAgent - Oracle Corporation - C:\oracle\bin\agntsrvc.exe
O23 - Service: Oracleoracle_eyeClientCache - Unknown owner - C:\oracle\BIN\ONRSD.EXE
O23 - Service: Oracleoracle_eyeHTTPServer - Unknown owner - C:\oracle\Apache\Apache\apache.exe
O23 - Service: Oracleoracle_eyePagingServer - Unknown owner - C:\oracle/bin/pagntsrv.exe
O23 - Service: Oracleoracle_eyeSNMPPeerEncapsulator - Unknown owner - C:\oracle\BIN\ENCSVC.EXE
O23 - Service: Oracleoracle_eyeSNMPPeerMasterAgent - Unknown owner - C:\oracle\BIN\AGNTSVC.EXE
O23 - Service: Oracleoracle_eyeTNSListener - Unknown owner - C:\oracle\BIN\TNSLSNR.exe
O23 - Service: OracleServiceEYEDB - Oracle Corporation - c:\oracle\bin\ORACLE.EXE
O23 - Service: OracleService- Oracle Corporation - c:\oracle\bin\ORACLE.EXE
O23 - Service: PostgreSQL Database Server 8.1 (pgsql-8.1) - PostgreSQL Global Development Group - C:\Programmi\PostgreSQL\8.1\bin\pg_ctl.exe
O23 - Service: Sandra Data Service (SandraDataSrv) - SiSoftware - C:\Programmi\SiSoftware\SiSoftware Sandra Lite 2005.SR3\RpcDataSrv.exe
O23 - Service: Sandra Service (SandraTheSrv) - SiSoftware - C:\Programmi\SiSoftware\SiSoftware Sandra Lite 2005.SR3\RpcSandraSrv.exe
O23 - Service: ServiceLayer - Nokia. - C:\Programmi\File comuni\PCSuite\Services\ServiceLayer.exe

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End of file - 7764 bytes

[c.m.g]

se sei infetto devi postare quì:

http://www.hwupgrade.it/forum/forumdisplay.php?f=125

i log di hijack this li devi postare quì:

http://www.hwupgrade.it/forum/showthread.php?t=937676