ho fatto come mi hai detto e questi sono i due log:

mbam:

codice:
Malwarebytes' Anti-Malware 1.44
Versione del database: 3510
Windows 5.1.2600 Service Pack 3
Internet Explorer 8.0.6001.18702

19/01/2010 21.52.18
mbam-log-2010-01-19 (21-52-18).txt

Tipo di scansione: Scansione completa (C:\|)
Elementi scansionati: 231441
Tempo trascorso: 1 hour(s), 35 minute(s), 12 second(s)

Processi delle memoria infetti: 0
Moduli della memoria infetti: 0
Chiavi di registro infette: 17
Valori di registro infetti: 0
Elementi dato del registro infetti: 0
Cartelle infette: 0
File infetti: 4

Processi delle memoria infetti:
(Nessun elemento malevolo rilevato)

Moduli della memoria infetti:
(Nessun elemento malevolo rilevato)

Chiavi di registro infette:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{500bca15-57a7-4eaf-8143-8c619470b13d} (Worm.Allaple) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{07b18eab-a523-4961-b6bb-170de4475cca} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{1d4db7d2-6ec9-47a3-bd87-1e41684e07bb} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{74ebcffb-af2d-4dd4-a9bc-2ac12864b3ec} (Trojan.BHO) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{59c7fc09-1c83-4648-b3e6-003d2bbc7481} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{68af847f-6e91-45dd-9b68-d6a12c30e5d7} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{9170b96c-28d4-4626-8358-27e6caeef907} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{d1a71fa0-ff48-48dd-9b6d-7a13a3e42127} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{ddb1968e-ead6-40fd-8dae-ff14757f60c7} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{f138d901-86f0-4383-99b6-9cdd406036da} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\PreApproved\{25560540-9571-4d7b-9389-0f166788785a} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\PreApproved\{3dc201fb-e9c9-499c-a11f-23c360d7c3f8} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\PreApproved\{63d0ed2c-b45b-4458-8b3b-60c69bbbd83c} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\PreApproved\{98d9753d-d73b-42d5-8c85-4469cda897ab} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\PreApproved\{9ff05104-b030-46fc-94b8-81276e4e27df} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Low Rights\RunDll32Policy\f3ScrCtr.dll (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Multimedia\WMPlayer\Schemes\f3pss (Adware.MyWebSearch) -> Quarantined and deleted successfully.

Valori di registro infetti:
(Nessun elemento malevolo rilevato)

Elementi dato del registro infetti:
(Nessun elemento malevolo rilevato)

Cartelle infette:
(Nessun elemento malevolo rilevato)

File infetti:
C:\System Volume Information\_restore{7BAA2FC5-F58A-4573-8022-31554FF9DE43}\RP391\A0270883.dll (Adware.MyWebSearch) -> Quarantined and deleted successfully.
C:\System Volume Information\_restore{7BAA2FC5-F58A-4573-8022-31554FF9DE43}\RP391\A0270880.scr (Adware.MyWebSearch) -> Quarantined and deleted successfully.
C:\System Volume Information\_restore{7BAA2FC5-F58A-4573-8022-31554FF9DE43}\RP391\A0270881.dll (Adware.MyWebSearch) -> Quarantined and deleted successfully.
C:\Documents and Settings\Lucia\Desktop\MakeTheWebBetter.exe (Adware.MakeTheWebBetter) -> Quarantined and deleted successfully.