Scusa paolopa, ho fatto un po' di confusione con i post. Non mi sono accorto di quello di r16 che mi dice di fixare alcune voci.
Ci tengo a risolvere il problema fino in fondo. Grazie

Per avviare Hijack, devo aspettare almeno un'oretta, perchè sto scaricando il sp 2(non ho molta banda!).
Per controllare il cd ho disattivato l'auto play ora controllo con Malwarebytes. Comunque l'avevo disinstallato e ora l'ho rinstallato. Posso tenerlo o entra in conflitto con Avast?

Senti nikopol : per favore, durante l'installazione del SP2, lascia perdere tutte le operazioni, e lascia scaricare l'aggiornamento senza interferenze.
Si potrebbero verificare dei blocchi, che possono compromettere l'installazione.
Si fà una cosa alla volta.
Grazie.

Va bene, non toccherò niente. Comunque non sto ancora aggiornando, sto ancora scaricando.
Grazie per la dritta

Ciao, ho aggiornato windows e fixato le voci da voi dette.
Il problema sembra essersi risolto.
Grazie

Posto il log di Hijack:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 0.19.29, on 21/04/2010
Platform: Windows Vista SP2 (WinNT 6.00.1906)
MSIE: Internet Explorer v7.00 (7.00.6002.18005)
Boot mode: Normal

Running processes:
C:\Windows\system32\Dwm.exe
C:\Windows\Explorer.EXE
C:\Program Files\Windows Defender\MSASCui.exe
C:\Windows\RtHDVCpl.exe
C:\Acer\Empowering Technology\SysMonitor.exe
C:\Acer\Empowering Technology\eDataSecurity\eDSloader.exe
C:\Program Files\Microsoft Xbox 360 Accessories\XBoxStat.exe
C:\Program Files\Java\jre6\bin\jusched.exe
D:\PROGRAMMI\SICUREZZA\Avast5\AvastUI.exe
C:\Windows\ehome\ehtray.exe
C:\Program Files\Packard Bell\Packard Bell Software Suite\Launcher.exe
C:\Windows\system32\taskeng.exe
C:\Windows\ehome\ehmsas.exe
C:\Windows\system32\rundll32.exe
C:\Program Files\Packard Bell\Packard Bell Software Suite\PowerSave\PowerSave.exe
C:\Windows\system32\wuauclt.exe
C:\Windows\System32\mobsync.exe
D:\PROGRAMMI\SICUREZZA\HijackThis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.tiscali.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://it.yahoo.com
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
R3 - URLSearchHook: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - (no file)
O1 - Hosts: ::1 localhost
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: Guida per l'accesso a Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Windows Live Toolbar Helper - {BDBD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Program Files\Windows Live Toolbar\msntb.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre6\bin\jp2ssv.dll
O3 - Toolbar: Acer eDataSecurity Management - {5CBE3B7C-1E47-477e-A7DD-396DB0476E29} - C:\Windows\system32\eDStoolbar.dll
O3 - Toolbar: Windows Live Toolbar - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Program Files\Windows Live Toolbar\msntb.dll
O4 - HKLM\..\Run: [Windows Defender] %ProgramFiles%\Windows Defender\MSASCui.exe -hide
O4 - HKLM\..\Run: [RtHDVCpl] RtHDVCpl.exe
O4 - HKLM\..\Run: [Acer Empowering Technology Monitor] C:\Acer\Empowering Technology\SysMonitor.exe
O4 - HKLM\..\Run: [eDataSecurity Loader] C:\Acer\Empowering Technology\eDataSecurity\eDSloader.exe
O4 - HKLM\..\Run: [WarReg_PopUp] C:\Acer\WR_PopUp\WarReg_PopUp.exe
O4 - HKLM\..\Run: [Acer Tour Reminder] C:\Acer\AcerTour\Reminder.exe
O4 - HKLM\..\Run: [XboxStat] "C:\Program Files\Microsoft Xbox 360 Accessories\XboxStat.exe" silentrun
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre6\bin\jusched.exe"
O4 - HKLM\..\Run: [avast5] D:\PROGRA~1\SICURE~1\Avast5\avastUI.exe /nogui
O4 - HKCU\..\Run: [Sidebar] C:\Program Files\Windows Sidebar\sidebar.exe /autoRun
O4 - HKCU\..\Run: [ehTray.exe] C:\Windows\ehome\ehTray.exe
O4 - HKCU\..\Run: [DAEMON Tools Lite] "C:\Program Files\MASTERIZZAZIONE\Daemon Tools Lite 4.12\daemon.exe" -autorun
O4 - HKCU\..\Run: [Packard Bell Software Suite] C:\Program Files\Packard Bell\Packard Bell Software Suite\Launcher.exe /run
O4 - HKCU\..\Run: [eMuleAutoStart] C:\Program Files\P2P\eMule\emule.exe -AutoStart
O8 - Extra context menu item: &Windows Live Search - res://C:\Program Files\Windows Live Toolbar\msntb.dll/search.htm
O8 - Extra context menu item: Add to Windows &Live Favorites - http://favorites.live.com/quickadd.aspx
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office12\EXCEL.EXE/3000
O9 - Extra button: Invia a OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~2\Office12\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: I&nvia a OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~2\Office12\ONBttnIE.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\Office12\REFIEBAR.DLL
O9 - Extra button: Organizzatore ricerche - {9455301C-CF6B-11D3-A266-00C04F689C50} - C:\Program Files\Common Files\Microsoft Shared\Encarta Researcher\EROPROJ.DLL
O9 - Extra button: PPLive - {95B3F550-91C4-4627-BCC4-521288C52977} - L:\Programmi\PPLive\PPLive.exe
O9 - Extra 'Tools' menuitem: PPLive - {95B3F550-91C4-4627-BCC4-521288C52977} - L:\Programmi\PPLive\PPLive.exe
O9 - Extra button: (no name) - {B205A35E-1FC4-4CE3-818B-899DBBB3388C} - C:\Program Files\Common Files\Microsoft Shared\Encarta Search Bar\ENCSBAR.DLL
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\COMMON~1\Skype\SKYPE4~1.DLL
O23 - Service: Acer HomeMedia Connect Service - CyberLink - C:\Program Files\Acer Arcade Live\Acer HomeMedia Connect\Kernel\DMS\CLMSServer.exe
O23 - Service: ePerformance Service (AcerMemUsageCheckService) - Unknown owner - C:\Acer\Empowering Technology\ePerformance\MemCheck.exe
O23 - Service: Ati External Event Utility - ATI Technologies Inc. - C:\Windows\system32\Ati2evxx.exe
O23 - Service: Autodesk Licensing Service - Autodesk - C:\Program Files\Common Files\Autodesk Shared\Service\AdskScSrv.exe
O23 - Service: avast! Antivirus - ALWIL Software - D:\PROGRAMMI\SICUREZZA\Avast5\AvastSvc.exe
O23 - Service: avast! Mail Scanner - ALWIL Software - D:\PROGRAMMI\SICUREZZA\Avast5\AvastSvc.exe
O23 - Service: avast! Web Scanner - ALWIL Software - D:\PROGRAMMI\SICUREZZA\Avast5\AvastSvc.exe
O23 - Service: eDSService.exe (eDataSecurity Service) - HiTRSUT - C:\Acer\Empowering Technology\eDataSecurity\eDSService.exe
O23 - Service: eRecovery Service (eRecoveryService) - Acer Inc. - C:\Acer\Empowering Technology\eRecovery\eRecoveryService.exe
O23 - Service: FLEXnet Licensing Service - Acresso Software Inc. - C:\Program Files\Common Files\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
O23 - Service: LightScribeService Direct Disc Labeling Service (LightScribeService) - Hewlett-Packard Company - C:\Program Files\Common Files\LightScribe\LSSrvc.exe
O23 - Service: NVIDIA Display Driver Service (nvsvc) - NVIDIA Corporation - C:\Windows\system32\nvvsvc.exe
O23 - Service: Macrium Reflect Image Mounting Service (ReflectService) - Unknown owner - C:\Program Files\Macrium\Reflect\ReflectService.exe
O23 - Service: Cyberlink RichVideo Service(CRVS) (RichVideo) - Unknown owner - C:\Program Files\CyberLink\Shared Files\RichVideo.exe
O23 - Service: Packard Bell Software Suite Service 1 (Service1) - Packard Bell Services - C:\Program Files\Packard Bell\Packard Bell Software Suite\PowerSave\HDPBSSS.exe
O23 - Service: Steam Client Service - Unknown owner - C:\Program Files\Common Files\Steam\SteamService.exe (file missing)
O23 - Service: NVIDIA Stereoscopic 3D Driver Service (Stereo Service) - NVIDIA Corporation - C:\Program Files\NVIDIA Corporation\3D Vision\nvSCPAPISvr.exe

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End of file - 7381 bytes