ciao amico:questo e' il nuvo pc dimmi un po cosa devo eliminare della miriade di applicazioni/cavolate inutili che assorbono il sistema; ci sono molte cose inutili secondo me...fammi un bel controllo...
ogfile of Trend Micro HijackThis v2.0.2
Scan saved at 20.37.13, on 10/04/2009
Platform: Windows Vista SP1 (WinNT 6.00.1905)
MSIE: Internet Explorer v7.00 (7.00.6001.18000)
Boot mode: Normal

Running processes:
C:\Windows\system32\taskeng.exe
C:\Windows\system32\Dwm.exe
C:\Program Files\Windows Defender\MSASCui.exe
C:\Program Files\DellTPad\Apoint.exe
C:\Program Files\IDT\WDM\sttray.exe
C:\Windows\System32\igfxtray.exe
C:\Windows\System32\hkcmd.exe
C:\Windows\System32\igfxpers.exe
C:\Program Files\Java\jre6\bin\jusched.exe
C:\Windows\system32\igfxsrvc.exe
C:\Windows\System32\WLTRAY.EXE
C:\Windows\System32\mobsync.exe
C:\Program Files\Intel\Intel Matrix Storage Manager\IAAnotif.exe
C:\Program Files\Dell Webcam\Dell Webcam Central\WebcamDell.exe
C:\Program Files\CyberLink\PowerDVD DX\PDVDDXSrv.exe
C:\Program Files\Dell Support Center\bin\sprtcmd.exe
C:\Program Files\DellTPad\ApMsgFwd.exe
C:\Program Files\DellTPad\HidFind.exe
C:\Program Files\AVG\AVG8\avgtray.exe
C:\Program Files\DellTPad\Apntex.exe
C:\Program Files\PC Tools Firewall Plus\FirewallGUI.exe
C:\Program Files\Windows Sidebar\sidebar.exe
C:\Windows\explorer.exe
C:\Windows\system32\SearchFilterHost.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://g.uk.msn.com/USCON/11
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.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 =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = Internet Explorer fornito da Dell
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O1 - Hosts: ::1 localhost
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: WormRadar.com IESiteBlocker.NavFilter - {3CA2F312-6F6E-4B53-A66E-4E65E497C8C0} - C:\Program Files\AVG\AVG8\avgssie.dll
O2 - BHO: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
O2 - BHO: Search Helper - {6EBF7485-159F-4bff-A14F-B9E3AAC4465B} - C:\Program Files\Microsoft\Search Enhancement Pack\Search Helper\SearchHelper.dll
O2 - BHO: Java(tm) Plug-In SSV Helper - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre6\bin\ssv.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: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre6\bin\jp2ssv.dll
O2 - BHO: Windows Live Toolbar Helper - {E15A8DC0-8516-42A1-81EA-DC94EC1ACF10} - C:\Program Files\Windows Live\Toolbar\wltcore.dll
O3 - Toolbar: &Windows Live Toolbar - {21FA44EF-376D-4D53-9B0F-8A89D3229068} - C:\Program Files\Windows Live\Toolbar\wltcore.dll
O4 - HKLM\..\Run: [Windows Defender] %ProgramFiles%\Windows Defender\MSASCui.exe -hide
O4 - HKLM\..\Run: [Apoint] C:\Program Files\DellTPad\Apoint.exe
O4 - HKLM\..\Run: [SysTrayApp] %ProgramFiles%\IDT\WDM\sttray.exe
O4 - HKLM\..\Run: [IgfxTray] C:\Windows\system32\igfxtray.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\Windows\system32\hkcmd.exe
O4 - HKLM\..\Run: [Persistence] C:\Windows\system32\igfxpers.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre6\bin\jusched.exe"
O4 - HKLM\..\Run: [Broadcom Wireless Manager UI] C:\Windows\system32\WLTRAY.exe
O4 - HKLM\..\Run: [QuickSet] C:\Program Files\Dell\QuickSet\QuickSet.exe
O4 - HKLM\..\Run: [IAAnotif] C:\Program Files\Intel\Intel Matrix Storage Manager\iaanotif.exe
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Program Files\Adobe\Reader 9.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [Dell Webcam Central] "C:\Program Files\Dell Webcam\Dell Webcam Central\WebcamDell.exe" /mode2
O4 - HKLM\..\Run: [PDVDDXSrv] "C:\Program Files\CyberLink\PowerDVD DX\PDVDDXSrv.exe"
O4 - HKLM\..\Run: [dellsupportcenter] "C:\Program Files\Dell Support Center\bin\sprtcmd.exe" /P dellsupportcenter
O4 - HKLM\..\Run: [AVG8_TRAY] C:\PROGRA~1\AVG\AVG8\avgtray.exe
O4 - HKLM\..\Run: [00PCTFW] "C:\Program Files\PC Tools Firewall Plus\FirewallGUI.exe" -s
O4 - HKCU\..\Run: [Sidebar] C:\Program Files\Windows Sidebar\sidebar.exe /autoRun
O4 - HKUS\S-1-5-19\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /detectMem (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-19\..\Run: [WindowsWelcomeCenter] rundll32.exe oobefldr.dll,ShowWelcomeCenter (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-20\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /detectMem (User 'SERVIZIO DI RETE')
O9 - Extra button: Inserisci blog - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Program Files\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra 'Tools' menuitem: Inserisci &blog in Windows Live Writer - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Program Files\Windows Live\Writer\WriterBrowserExtension.dll
O13 - Gopher Prefix:
O18 - Protocol: linkscanner - {F274614C-63F8-47D5-A4D1-FBDDE494F8D1} - C:\Program Files\AVG\AVG8\avgpp.dll
O20 - AppInit_DLLs: avgrsstx.dll
O20 - Winlogon Notify: GoToAssist - C:\Program Files\Citrix\GoToAssist\514\G2AWinLogon.dll
O23 - Service: Andrea ST Filters Service (AESTFilters) - Andrea Electronics Corporation - C:\Windows\System32\DriverStore\FileRepository\stwrt.inf_ae0b52e0\aestsrv.exe
O23 - Service: AVG Free8 E-mail Scanner (avg8emc) - AVG Technologies CZ, s.r.o. - C:\PROGRA~1\AVG\AVG8\avgemc.exe
O23 - Service: AVG Free8 WatchDog (avg8wd) - AVG Technologies CZ, s.r.o. - C:\PROGRA~1\AVG\AVG8\avgwdsvc.exe
O23 - Service: GoToAssist - Citrix Online, a division of Citrix Systems, Inc. - C:\Program Files\Citrix\GoToAssist\514\g2aservice.exe
O23 - Service: Intel(R) Matrix Storage Event Monitor (IAANTMON) - Intel Corporation - C:\Program Files\Intel\Intel Matrix Storage Manager\IAANTMon.exe
O23 - Service: PC Tools Firewall Plus (PCToolsFirewallPlus) - PC Tools - C:\Program Files\PC Tools Firewall Plus\FWService.exe
O23 - Service: SupportSoft Sprocket Service (DellSupportCenter) (sprtsvc_DellSupportCenter) - SupportSoft, Inc. - C:\Program Files\Dell Support Center\bin\sprtsvc.exe
O23 - Service: Audio Service (STacSV) - IDT, Inc. - C:\Windows\System32\DriverStore\FileRepository\stwrt.inf_ae0b52e0\STacSV.exe
O23 - Service: stllssvr - MicroVision Development, Inc. - C:\Program Files\Common Files\SureThing Shared\stllssvr.exe
O23 - Service: Dell Wireless WLAN Tray Service (wltrysvc) - Unknown owner - C:\Windows\System32\WLTRYSVC.EXE
O23 - Service: Marvell Yukon Service (yksvc) - Unknown owner - RUNDLL32.EXE (file missing)

--
End of file - 7349 bytes

Ciao Rio.
Non conosco bene Vista, e penso che mai lo conoscerò.
Se dovessi cambiare pc, o S.O, farò installare Windows 7, che dicono sia migliore di Vista.
Comunque nel log che hai postato, non c'è niente da levare, a parte questa voce:
O2 - BHO: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
Goditi il pc nuovo di stecca, e fai attenzione a tenere l'antivirus aggiornato (mi sembra che hai la versione vecchia di AVG). E anche il Java non mi sembra recente.
Fai ogni tanto una pulizia con CCleaner
Installa Malwarebytes, che è un programma valido.
Aggiornalo sempre prima di ogni scansione, e se rileva qualcosa, posta il log nel forum prima di eliminare i file.
Tanti Auguri di buona Pasqua Rio.
Ciao!