Ciao,
Ho un problema con l'installazione di un antivirus, ho provato più di uno e c'è sempre un problema di installazione.
ho scaricato hijackthis e ecco il rapporto che mi ha dato

grazie in anticipo

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 15:52:14, on 07/05/2009
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.20815)
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\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\Fichiers communs\Real\Update_OB\realsched.exe
C:\Program Files\CyberLink\PowerDVD\PDVDServ.exe
C:\Program Files\Real\RealPlayer\RealPlay.exe
C:\Program Files\Real\RealPlayer\RealPlay.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\CyberLink\Shared files\RichVideo.exe
C:\Program Files\CyberLink\PowerDVD\PowerDVD.exe
C:\Program Files\HSDPA USB MODEM\USB Modem.exe
C:\Program Files\Windows Media Player\wmplayer.exe
C:\Documents and Settings\Administrateur\Bureau\Portable_Opera.exe
C:\Documents and Settings\Administrateur\Bureau\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.fr/
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 = http://www.google.fr/
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: RealPlayer Download and Record Plugin for Internet Explorer - {3049C3E9-B461-4BC5-8870-4C09146192CA} - C:\Program Files\Real\RealPlayer\rpbrowserrecordplugin.dll
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Fichiers communs\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [RemoteControl] "C:\Program Files\CyberLink\PowerDVD\PDVDServ.exe"
O4 - HKLM\..\Run: [LanguageShortcut] "C:\Program Files\CyberLink\PowerDVD\Language\Language.exe"
O4 - HKUS\S-1-5-19\..\RunOnce: [ShowDeskFix] regsvr32 /s /n /i:u shell32 (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-19\..\RunOnce: [IE7-10] rundll32 advpack.dll,LaunchINFSectionEx NR_IE7en.inf,AfterUserStart,,4,N (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-20\..\RunOnce: [ShowDeskFix] regsvr32 /s /n /i:u shell32 (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-18\..\RunOnce: [ShowDeskFix] regsvr32 /s /n /i:u shell32 (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\RunOnce: [ShowDeskFix] regsvr32 /s /n /i:u shell32 (User 'Default user')
O7 - HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System, DisableRegedit=1
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office12\EXCEL.EXE/3000
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\Office12\REFIEBAR.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
O17 - HKLM\System\CCS\Services\Tcpip\..\{9EE98C3B-6855-4727-BF67-83D7252DEAF3}: NameServer = 194.25.0.68 194.25.0.60
O23 - Service: Cyberlink RichVideo Service(CRVS) (RichVideo) - Unknown owner - C:\Program Files\CyberLink\Shared files\RichVideo.exe

End of file - 3713 bytes