Qualche utente esperto mi da, per favore, uno sguardo al log. Mi si aprono anche pagine pubblicitarie fastidiose mentre navigo. grazie.

Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 09:23:48, on 13/04/2011
Platform: Windows 7 SP1 (WinNT 6.00.3505)
MSIE: Internet Explorer v9.00 (9.00.8112.16421)
Boot mode: Normal

Running processes:
C:\Program Files (x86)\Zentimo\Zentimo.exe
C:\Program Files (x86)\Common Files\Ahead\Lib\NMIndexStoreSvr.exe
C:\Program Files (x86)\Internet Explorer\IELowutil.exe
C:\Program Files (x86)\Mozilla Firefox\firefox.exe
C:\Program Files (x86)\Mozilla Firefox\plugin-container.exe
H:\Rapid\HijackThis.exe
C:\Windows\SysWOW64\NOTEPAD.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.corriere.it/
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
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = http://start.facemoods.com/?a=ddr&s={searchTerms}&f=4
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page = C:\Windows\SysWOW64\blank.htm
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O2 - BHO: Guida per l'accesso a Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files (x86)\Java\jre6\bin\jp2ssv.dll
O3 - Toolbar: facemoods Toolbar - {DB4E9724-F518-4dfd-9C7C-78B52103CAB9} - C:\Program Files (x86)\facemoods.com\facemoods\1.4.17.5\facemoodsTlbr.dll
O4 - HKCU\..\Run: [Zentimo xStorage Manager] C:\Program Files (x86)\Zentimo\Zentimo.exe /startup
O4 - HKCU\..\Run: [Sidebar] C:\Program Files\Windows Sidebar\sidebar.exe /autoRun
O11 - Options group: [ACCELERATED_GRAPHICS] Accelerated graphics
O23 - Service: Servizio Acronis Scheduler2 (AcrSch2Svc) - Acronis - C:\Program Files (x86)\Common Files\Acronis\Schedule2\schedul2.exe
O23 - Service: Acronis Nonstop Backup service (afcdpsrv) - Acronis - C:\Program Files (x86)\Common Files\Acronis\CDP\afcdpsrv.exe
O23 - Service: @%SystemRoot%\system32\Alg.exe,-112 (ALG) - Unknown owner - C:\Windows\System32\alg.exe (file missing)
O23 - Service: AMD External Events Utility - Unknown owner - C:\Windows\system32\atiesrxx.exe (file missing)
O23 - Service: CSIScanner - Prevx - C:\Program Files\Prevx\prevx.exe
O23 - Service: @%SystemRoot%\system32\efssvc.dll,-100 (EFS) - Unknown owner - C:\Windows\System32\lsass.exe (file missing)
O23 - Service: @%systemroot%\system32\fxsresm.dll,-118 (Fax) - Unknown owner - C:\Windows\system32\fxssvc.exe (file missing)
O23 - Service: Servizio di Google Update (gupdate) (gupdate) - Google Inc. - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe
O23 - Service: @keyiso.dll,-100 (KeyIso) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: MBAMService - Malwarebytes Corporation - C:\Program Files (x86)\Malwarebytes' Anti-Malware\mbamservice.exe
O23 - Service: @comres.dll,-2797 (MSDTC) - Unknown owner - C:\Windows\System32\msdtc.exe (file missing)
O23 - Service: NBService - Nero AG - C:\Program Files (x86)\Nero\Nero 7\Nero BackItUp\NBService.exe
O23 - Service: @%SystemRoot%\System32\netlogon.dll,-102 (Netlogon) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: NMIndexingService - Nero AG - C:\Program Files (x86)\Common Files\Ahead\Lib\NMIndexingService.exe
O23 - Service: PDAgent - Raxco Software, Inc. - C:\Program Files\Raxco\PerfectDisk10\PDAgent.exe
O23 - Service: PDEngine - Raxco Software, Inc. - C:\Program Files\Raxco\PerfectDisk10\PDEngine.exe
O23 - Service: @%systemroot%\system32\psbase.dll,-300 (ProtectedStorage) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: Macrium Reflect Image Mounting Service (ReflectService) - Unknown owner - C:\Program Files\Macrium\Reflect\ReflectService.exe
O23 - Service: @%systemroot%\system32\Locator.exe,-2 (RpcLocator) - Unknown owner - C:\Windows\system32\locator.exe (file missing)
O23 - Service: @%SystemRoot%\system32\samsrv.dll,-1 (SamSs) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: @%SystemRoot%\system32\snmptrap.exe,-3 (SNMPTRAP) - Unknown owner - C:\Windows\System32\snmptrap.exe (file missing)
O23 - Service: @%systemroot%\system32\spoolsv.exe,-1 (Spooler) - Unknown owner - C:\Windows\System32\spoolsv.exe (file missing)
O23 - Service: @%SystemRoot%\system32\sppsvc.exe,-101 (sppsvc) - Unknown owner - C:\Windows\system32\sppsvc.exe (file missing)
O23 - Service: @%SystemRoot%\system32\ui0detect.exe,-101 (UI0Detect) - Unknown owner - C:\Windows\system32\UI0Detect.exe (file missing)
O23 - Service: @%SystemRoot%\system32\vaultsvc.dll,-1003 (VaultSvc) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: @%SystemRoot%\system32\vds.exe,-100 (vds) - Unknown owner - C:\Windows\System32\vds.exe (file missing)
O23 - Service: @%systemroot%\system32\vssvc.exe,-102 (VSS) - Unknown owner - C:\Windows\system32\vssvc.exe (file missing)
O23 - Service: @%SystemRoot%\system32\Wat\WatUX.exe,-601 (WatAdminSvc) - Unknown owner - C:\Windows\system32\Wat\WatAdminSvc.exe (file missing)
O23 - Service: @%systemroot%\system32\wbengine.exe,-104 (wbengine) - Unknown owner - C:\Windows\system32\wbengine.exe (file missing)
O23 - Service: @%Systemroot%\system32\wbem\wmiapsrv.exe,-110 (wmiApSrv) - Unknown owner - C:\Windows\system32\wbem\WmiApSrv.exe (file missing)
O23 - Service: @%PROGRAMFILES%\Windows Media Player\wmpnetwk.exe,-101 (WMPNetworkSvc) - Unknown owner - C:\Program Files (x86)\Windows Media Player\wmpnetwk.exe (file missing)
O23 - Service: Zentimo Assistant (ZentimoService) - Unknown owner - C:\Program Files (x86)\Zentimo\ZentimoService.exe

--
End of file - 6302 bytes

Ciao, dal log non vedo nessun antivirus, oppure mi è sfuggito, se non ne hai installa QUESTO che è molto valido, poi attiva il firewall di Seven.
Poi chiudi tutti i programmi e disconnesso da internet, fixa queste voci ed eliminale:

R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = http://start.facemoods.com/?a=ddr&s={searchTerms}&f=4

O3 - Toolbar: facemoods Toolbar - {DB4E9724-F518-4dfd-9C7C-78B52103CAB9} - C:\Program Files (x86)\facemoods.com\facemoods\1.4.17.5\facemoodsTlbr.dll

Questo programma lo hai installato tu ? Zentimo.exe, se non lo conosci elimina queste altre voci:

C:\Program Files (x86)\Zentimo\Zentimo.exe

O4 - HKCU\..\Run: [Zentimo xStorage Manager] C:\Program Files (x86)\Zentimo\Zentimo.exe /startup

O23 - Service: Zentimo Assistant (ZentimoService) - Unknown owner - C:\Program Files (x86)\Zentimo\ZentimoService.exe.
Fai una scansione con Malwarebytes, prima aggiornalo e poi fai una scansione COMPLETA, non veloce,
elimina tutto quello che trova.
Fai anche una pulizia con Ccleaner, compreso il registro.
Fai una scansione completa con l'antivirus che ti ho segnalato.
Fai sapere.