Ho lanciato (con vari problemi per scaricarli) i due tool segnalati nel post ke mi avete suggerito.
Hanno fatto una scansione, ma non credo ke sia cambiano nulla.

Cmq vi posto ciò ke ha creato il programma.

Logfile of HijackThis v1.99.1
Scan saved at 12.46.10, on 14/12/2006
Platform: Windows XP (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 (6.00.2600.0000)

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:\Documents and Settings\Rossella\Desktop\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page =
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
R3 - Default URLSearchHook is missing
O2 - BHO: (no name) - {BDBD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - (no file)
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE
O4 - HKCU\..\Run: [msnmsgr] "C:\Programmi\MSN Messenger\msnmsgr.exe" /background
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\
O23 - Service: Dragon Age - Bioware - Unknown owner - C:\WINDOWS\System32\dllcache\dragonage.exe
O23 - Service: EPSON Printer Status Agent2 (EPSONStatusAgent2) - SEIKO EPSON CORPORATION - C:\Programmi\File comuni\EPSON\EBAPI\SAgent2.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programmi\File comuni\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: NVIDIA Driver Helper Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
O23 - Service: SoundMAX Agent Service (SoundMAX Agent Service (default)) - Analog Devices, Inc. - C:\Programmi\Analog Devices\SoundMAX\SMAgent.exe