ciao a tutti questo è il mio log hjt:
Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 21.43.05, on 26/01/2011
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.17093)
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:\Programmi\Intel\Wireless\Bin\EvtEng.exe
C:\Programmi\Intel\Wireless\Bin\S24EvMon.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\Avira\AntiVir Desktop\sched.exe
C:\Programmi\Avira\AntiVir Desktop\avguard.exe
C:\Programmi\Avira\AntiVir Desktop\avshadow.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Java\jre6\bin\jqs.exe
C:\Programmi\File comuni\LightScribe\LSSrvc.exe
C:\Programmi\Intel\Wireless\Bin\RegSrvc.exe
C:\Programmi\Microsoft\Search Enhancement Pack\SeaPort\SeaPort.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Vodafone\Vodafone Mobile Connect\Bin\VMCService.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\RTHDCPL.EXE
C:\WINDOWS\sm56hlpr.exe
C:\Programmi\Avira\AntiVir Desktop\avgnt.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\OpenOffice.org 3\program\soffice.exe
C:\Programmi\OpenOffice.org 3\program\soffice.bin
C:\WINDOWS\system32\winlogon.exe
C:\Documents and Settings\Alessandra_2\Impostazioni locali\Dati applicazioni\Google\Chrome\Application\chrome.exe
C:\Documents and Settings\Alessandra_2\Impostazioni locali\Dati applicazioni\Google\Chrome\Application\chrome.exe
C:\Documents and Settings\Alessandra_2\Impostazioni locali\Dati applicazioni\Google\Chrome\Application\chrome.exe
C:\Documents and Settings\Alessandra_2\Impostazioni locali\Dati applicazioni\Google\Chrome\Application\chrome.exe
C:\Documents and Settings\Alessandra_2\Impostazioni locali\Dati applicazioni\Google\Chrome\Application\chrome.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Documents and Settings\Alessandra_2\Impostazioni locali\Dati applicazioni\Google\Chrome\Application\chrome.exe
C:\Programmi\Trend Micro\HiJackThis\HiJackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://downloads.phpnuke.org/it/index.php?rvs=google
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
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://downloads.phpnuke.org/it/index.php?rvs=google
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://downloads.phpnuke.org/it/index.php?rvs=google
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Programmi\File comuni\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Programmi\Java\jre6\bin\jp2ssv.dll
O2 - BHO: Windows Live Toolbar Helper - {E15A8DC0-8516-42A1-81EA-DC94EC1ACF10} - C:\Programmi\Windows Live\Toolbar\wltcore.dll (file missing)
O2 - BHO: JQSIEStartDetectorImpl - {E7E6F031-17CE-4C07-BC86-EABFE594F69C} - C:\Programmi\Java\jre6\lib\deploy\jqs\ie\jqs_plugin.dll
O3 - Toolbar: &Windows Live Toolbar - {21FA44EF-376D-4D53-9B0F-8A89D3229068} - C:\Programmi\Windows Live\Toolbar\wltcore.dll (file missing)
O4 - HKLM\..\Run: [RTHDCPL] RTHDCPL.EXE
O4 - HKLM\..\Run: [SMSERIAL] sm56hlpr.exe
O4 - HKLM\..\Run: [avgnt] "C:\Programmi\Avira\AntiVir Desktop\avgnt.exe" /min
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [Google Update] "C:\Documents and Settings\Alessandra_2\Impostazioni locali\Dati applicazioni\Google\Update\GoogleUpdate.exe" /c
O4 - HKUS\S-1-5-21-4137049308-325496431-2023043490-1012\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe (User 'Chicchita & Co')
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 - Startup: OpenOffice.org 3.2.lnk = C:\Programmi\OpenOffice.org 3\program\quickstart.exe
O9 - Extra button: Inserisci blog - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\WINDOWS\system32\shdocvw.dll
O9 - Extra 'Tools' menuitem: Inserisci &blog in Windows Live Writer - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\WINDOWS\system32\shdocvw.dll
O9 - Extra button: Visualizza o nasconde HP Smart Web Printing - {DDE87865-83C5-48c4-8357-2F5B1AA84522} - C:\WINDOWS\system32\shdocvw.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
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\FILECO~1\Skype\SKYPE4~1.DLL
O22 - SharedTaskScheduler: Precaricatore Browseui - {438755C2-A8BA-11D1-B96B-00A0C90312E1} - C:\WINDOWS\system32\browseui.dll
O22 - SharedTaskScheduler: Daemon di cache delle categorie di componenti - {8C7461EF-2B13-11d2-BE35-3078302C2030} - C:\WINDOWS\system32\browseui.dll
O23 - Service: Adobe LM Service - Adobe Systems - C:\Programmi\File comuni\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: Avira AntiVir Scheduler (AntiVirScheduler) - Avira GmbH - C:\Programmi\Avira\AntiVir Desktop\sched.exe
O23 - Service: Avira AntiVir Guard (AntiVirService) - Avira GmbH - C:\Programmi\Avira\AntiVir Desktop\avguard.exe
O23 - Service: Intel(R) PROSet/Wireless Event Log (EvtEng) - Intel Corporation - C:\Programmi\Intel\Wireless\Bin\EvtEng.exe
O23 - Service: Servizio Windows Live Family Safety (fsssvc) - Unknown owner - C:\Programmi\Windows Live\Family Safety\fsssvc.exe (file missing)
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programmi\File comuni\InstallShield\Driver\1150\Intel 32\IDriverT.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Programmi\Java\jre6\bin\jqs.exe
O23 - Service: LightScribeService Direct Disc Labeling Service (LightScribeService) - Hewlett-Packard Company - C:\Programmi\File comuni\LightScribe\LSSrvc.exe
O23 - Service: MSCSPTISRV - Sony Corporation - C:\Programmi\File comuni\Sony Shared\AVLib\MSCSPTISRV.exe
O23 - Service: PACSPTISVR - Unknown owner - C:\Programmi\File comuni\Sony Shared\AVLib\PACSPTISVR.exe
O23 - Service: Intel(R) PROSet/Wireless Registry Service (RegSrvc) - Intel Corporation - C:\Programmi\Intel\Wireless\Bin\RegSrvc.exe
O23 - Service: Intel(R) PROSet/Wireless Service (S24EventMonitor) - Intel Corporation - C:\Programmi\Intel\Wireless\Bin\S24EvMon.exe
O23 - Service: Sony SPTI Service (SPTISRV) - Sony Corporation - C:\Programmi\File comuni\Sony Shared\AVLib\SPTISRV.exe
O23 - Service: Vodafone Mobile Connect Service (VMCService) - Vodafone - C:\Programmi\Vodafone\Vodafone Mobile Connect\Bin\VMCService.exe

--
End of file - 7191 bytes

ho provato a installare windows live messenger 2009 ma mi si installano le applicazioni, ma poi non riesco ad usarle!!!!!!!!!! in caso non potete dirmi che cosa eliminare (delle cosa installate in generale e di messenger) e poi provo a reinstallarlo!?!?
Grazie milleeeeee!

!!!!!!!!!

!!!!!!!!!!!!

Il log mi sembra pulito

manca un programma firewall, instala Outpost
http://software.aiutamici.com/software?ID=80361

installa MalwareBytes per controllare e rimuovere eventuali spyware
http://software.aiutamici.com/software?ID=80346

disinstalla Windows Live, riavvia il sistema e reinstallalo.

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alfonso_aiutamici@hotmail.it

fatto...grazie mille!