all'immissione di qualunque indirizzo web, interviene un sito intruso che mi blocca la ricerca chiedendomi di comprare il loro antivirus. per altro di dubbia esistenza!...
P.S. Possiedo gia un`antivirus regolarmente registrato!...McAfee Security center


Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 20.24.54, on 29/12/2009
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v8.00 (8.00.6001.18702)
Boot mode: Normal

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\system32\spoolsv.exe
C:\Program Files\McAfee\SiteAdvisor\McSACore.exe
C:\PROGRA~1\McAfee\MSC\mcmscsvc.exe
c:\PROGRA~1\COMMON~1\mcafee\mna\mcnasvc.exe
C:\WINDOWS\Explorer.EXE
c:\PROGRA~1\COMMON~1\mcafee\mcproxy\mcproxy.exe
C:\Program Files\Intel\Intel Matrix Storage Manager\iaanotif.exe
C:\Program Files\Launch Manager\LManager.exe
C:\WINDOWS\system32\igfxtray.exe
C:\WINDOWS\system32\hkcmd.exe
C:\WINDOWS\system32\igfxpers.exe
C:\Program Files\McAfee\MPF\MPFSrv.exe
C:\WINDOWS\RTHDCPL.EXE
C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
C:\Program Files\McAfee.com\Agent\mcagent.exe
C:\Program Files\McAfee\MSK\MskSrver.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Windows Live\Messenger\msnmsgr.exe
C:\WINDOWS\system32\igfxsrvc.exe
C:\Program Files\Acer\Acer VCM\RS_Service.exe
C:\Program Files\Acer\Acer VCM\AcerVCM.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Intel\Intel Matrix Storage Manager\IAANTMon.exe
C:\WINDOWS\system32\igfxext.exe
C:\PROGRA~1\McAfee\VIRUSS~1\mcsysmon.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\PROGRA~1\McAfee\VIRUSS~1\mcshield.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://homepage.acer.com/rdr.aspx?b=ACAW&l=0409&m=ao531h&r=0xph10091506l0343wu05w87n64768
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = ${URL_SEARCHPAGE}
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.co.uk/ig
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://homepage.acer.com/rdr.aspx?b=ACAW&l=0409&m=ao531h&r=0xph10091506l0343wu05w87n64768
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 = ${URL_SEARCHPAGE}
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://homepage.acer.com/rdr.aspx?b=ACAW&l=0409&m=ao531h&r=0xph10091506l0343wu05w87n64768
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = "C:\Program Files\Outlook Express\msimn.exe"
R3 - URLSearchHook: Shareware.Pro-EN Toolbar - {bc3abe80-8ccd-4093-955d-a087dda18266} - C:\Program Files\Shareware.Pro-EN\tbSha1.dll
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: McAfee Phishing Filter - {27B4851A-3207-45A2-B947-BE8AFE6163AB} - c:\PROGRA~1\mcafee\msk\mskapbho.dll
O2 - BHO: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
O2 - BHO: scriptproxy - {7DB2D5A0-7241-4E79-B68D-6309F01C5231} - C:\Program Files\McAfee\VirusScan\scriptsn.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: McAfee SiteAdvisor BHO - {B164E929-A1B6-4A06-B104-2CD0E90A88FF} - c:\PROGRA~1\mcafee\SITEAD~1\mcieplg.dll
O2 - BHO: Shareware.Pro-EN Toolbar - {bc3abe80-8ccd-4093-955d-a087dda18266} - C:\Program Files\Shareware.Pro-EN\tbSha1.dll
O2 - BHO: &UpdateCheck.dll - {C213ED2A-7141-44CF-A0B1-1AE95A9A4BA6} - C:\WINDOWS\system32\UpdateCheck.dll
O3 - Toolbar: Shareware.Pro-EN Toolbar - {bc3abe80-8ccd-4093-955d-a087dda18266} - C:\Program Files\Shareware.Pro-EN\tbSha1.dll
O3 - Toolbar: McAfee SiteAdvisor Toolbar - {0EBBBE48-BAD4-4B4C-8E5A-516ABECAE064} - c:\PROGRA~1\mcafee\SITEAD~1\mcieplg.dll
O4 - HKLM\..\Run: [IAAnotif] C:\Program Files\Intel\Intel Matrix Storage Manager\iaanotif.exe
O4 - HKLM\..\Run: [LManager] C:\Program Files\Launch Manager\LManager.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: [RTHDCPL] RTHDCPL.EXE
O4 - HKLM\..\Run: [Alcmtr] ALCMTR.EXE
O4 - HKLM\..\Run: [AzMixerSel] C:\Program Files\Realtek\Audio\Drivers\AzMixerSel.exe
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Program Files\Adobe\Reader 9.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [IMJPMIG8.1] "C:\WINDOWS\IME\imjp8_1\IMJPMIG.EXE" /Spoil /RemAdvDef /Migration32
O4 - HKLM\..\Run: [MSPY2002] C:\WINDOWS\system32\IME\PINTLGNT\ImScInst.exe /SYNC
O4 - HKLM\..\Run: [PHIME2002ASync] C:\WINDOWS\system32\IME\TINTLGNT\TINTSETP.EXE /SYNC
O4 - HKLM\..\Run: [PHIME2002A] C:\WINDOWS\system32\IME\TINTLGNT\TINTSETP.EXE /IMEName
O4 - HKLM\..\Run: [PLFSetL] C:\WINDOWS\PLFSetL.exe
O4 - HKLM\..\Run: [snp2uvc] rundll32.exe C:\WINDOWS\system32\csnp2uvc.dll,ResetCIDS
O4 - HKLM\..\Run: [SynTPEnh] C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
O4 - HKLM\..\Run: [mcagent_exe] "C:\Program Files\McAfee.com\Agent\mcagent.exe" /runkey
O4 - HKLM\..\Run: [McENUI] C:\PROGRA~1\McAfee\MHN\McENUI.exe /hide
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [ProductReg] "C:\Program Files\Acer\WR_PopUp\ProductReg.exe"
O4 - HKCU\..\Run: [msnmsgr] "C:\Program Files\Windows Live\Messenger\msnmsgr.exe" /background
O4 - HKCU\..\Run: [AV] C:\Program Files\AV\Antivir.exe
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - Global Startup: Acer VCM.lnk = ?
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
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O18 - Protocol: dssrequest - {5513F07E-936B-4E52-9B00-067394E91CC5} - c:\PROGRA~1\mcafee\SITEAD~1\mcieplg.dll
O18 - Protocol: sacore - {5513F07E-936B-4E52-9B00-067394E91CC5} - c:\PROGRA~1\mcafee\SITEAD~1\mcieplg.dll
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\Program Files\Acer\Acer VCM\Skype4COM.dll
O23 - Service: Intel(R) Matrix Storage Event Monitor (IAANTMON) - Intel Corporation - C:\Program Files\Intel\Intel Matrix Storage Manager\IAANTMon.exe
O23 - Service: McAfee SiteAdvisor Service - McAfee, Inc. - C:\Program Files\McAfee\SiteAdvisor\McSACore.exe
O23 - Service: McAfee Services (mcmscsvc) - McAfee, Inc. - C:\PROGRA~1\McAfee\MSC\mcmscsvc.exe
O23 - Service: McAfee Network Agent (McNASvc) - McAfee, Inc. - c:\PROGRA~1\COMMON~1\mcafee\mna\mcnasvc.exe
O23 - Service: McAfee Scanner (McODS) - McAfee, Inc. - C:\PROGRA~1\McAfee\VIRUSS~1\mcods.exe
O23 - Service: McAfee Proxy Service (McProxy) - McAfee, Inc. - c:\PROGRA~1\COMMON~1\mcafee\mcproxy\mcproxy.exe
O23 - Service: McAfee Real-time Scanner (McShield) - McAfee, Inc. - C:\PROGRA~1\McAfee\VIRUSS~1\mcshield.exe
O23 - Service: McAfee SystemGuards (McSysmon) - McAfee, Inc. - C:\PROGRA~1\McAfee\VIRUSS~1\mcsysmon.exe
O23 - Service: McAfee Personal Firewall Service (MpfService) - McAfee, Inc. - C:\Program Files\McAfee\MPF\MPFSrv.exe
O23 - Service: McAfee Anti-Spam Service (MSK80Service) - McAfee, Inc. - C:\Program Files\McAfee\MSK\MskSrver.exe
O23 - Service: Raw Socket Service (RS_Service) - Acer Incorporated - C:\Program Files\Acer\Acer VCM\RS_Service.exe

--
End of file - 8385 bytes

io proverei a fare una scansione con malwarebytes:
http://software.aiutamici.com/software?ID=80346
lo scarichi,lo aggiorni e fai una scansione completa,meglio se in modalita' provvisoria.
non è un dialer,quelli ti dirottano(se non hai l adsl)verso numeri a pagamento,e non è il tuo caso.