su un vecchio pc con so windows 98 ho formattato prima e poi installato xp1 inizialmente ho installato avast come antivirus e mi ha trovato 900 file infetti con il virus W32.Virut.A


ho fatto una scansione online dal sito della symantec ed anche qui mi ha trovato lo stesso virus.

allego il file log di hijack
Logfile of HijackThis v1.99.1
Scan saved at 20.11.36, on 11/09/2006
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Unable to get Internet Explorer version!

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\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\update\updmgr.exe
C:\Programmi\I-Storm USB ADSL Modem\CnxDslTb.exe
C:\Programmi\Messenger\msmsgs.exe
C:\Programmi\Dachshund Software\Hare\Hare.exe
C:\Programmi\Spybot - Search & Destroy\SpybotSD.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\Programmi\Microsoft Office\Office\WINWORD.EXE
C:\WINDOWS\msagent\AgentSvr.exe
C:\Documents and Settings\roberto\Impostazioni locali\Temp\Directory temporanea 2 per hijackthis.zip\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.it/
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\Programmi\Spybot - Search & Destroy\SDHelper.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O4 - HKLM\..\Run: [CnxDslTaskBar] C:\Programmi\I-Storm USB ADSL Modem\CnxDslTb.exe
O4 - HKLM\..\Run: [Microsoft (R) Windows Update Manager] C:\WINDOWS\update\updmgr.exe
O4 - HKLM\..\RunServices: [Windows Update] Windowsupfixer.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - Startup: Hare.lnk = C:\Programmi\Dachshund Software\Hare\Hare.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office\OSA9.EXE
O16 - DPF: {2BC66F54-93A8-11D3-BEB6-00105AA9B6AE} (Symantec AntiVirus scanner) - http://security.symantec.com/sscv6/SharedContent/vc/bin/AvSniff.cab
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/windowsupdate/v6/V5Controls/en/x86/client/wuweb_site.cab?1157831730829
O16 - DPF: {644E432F-49D3-41A1-8DD5-E099162EEEC5} (Symantec RuFSI Utility Class) - http://security.symantec.com/sscv6/SharedContent/common/bin/cabsa.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{28A20969-183E-4145-9EBF-BFE2ADC84214}: NameServer = 85.37.17.40 85.38.28.85
O17 - HKLM\System\CS1\Services\Tcpip\..\{28A20969-183E-4145-9EBF-BFE2ADC84214}: NameServer = 85.37.17.40 85.38.28.85
O23 - Service: Windows Update Manager (UpdateManager) - Unknown owner - C:\WINDOWS\update\updmgr.exe

posso risolvere secondo voi
grazie della'aiuto

ho fatto un 'po di pulizia

riposto il log
Logfile of HijackThis v1.99.1
Scan saved at 21.51.20, on 11/09/2006
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Unable to get Internet Explorer version!

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:\WINDOWS\Explorer.EXE
C:\Programmi\ewido anti-spyware 4.0\guard.exe
C:\Programmi\I-Storm USB ADSL Modem\CnxDslTb.exe
C:\Programmi\ewido anti-spyware 4.0\ewido.exe
C:\Programmi\Messenger\msmsgs.exe
C:\Programmi\Dachshund Software\Hare\Hare.exe
C:\Documents and Settings\roberto\Desktop\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.it/
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: Yahoo! Toolbar Helper - {02478D38-C3F9-4EFB-9B51-7695ECA05670} - C:\Programmi\Yahoo!\Companion\Installs\cpn\yt.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\Programmi\Spybot - Search & Destroy\SDHelper.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Programmi\Yahoo!\Companion\Installs\cpn\yt.dll
O4 - HKLM\..\Run: [CnxDslTaskBar] C:\Programmi\I-Storm USB ADSL Modem\CnxDslTb.exe
O4 - HKLM\..\Run: [!ewido] "C:\Programmi\ewido anti-spyware 4.0\ewido.exe" /minimized
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - Startup: Hare.lnk = C:\Programmi\Dachshund Software\Hare\Hare.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office\OSA9.EXE
O16 - DPF: {193C772A-87BE-4B19-A7BB-445B226FE9A1} (ewidoOnlineScan Control) - http://download.ewido.net/ewidoOnlineScan.cab
O16 - DPF: {2BC66F54-93A8-11D3-BEB6-00105AA9B6AE} (Symantec AntiVirus scanner) - http://security.symantec.com/sscv6/SharedContent/vc/bin/AvSniff.cab
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/windowsupdate/v6/V5Controls/en/x86/client/wuweb_site.cab?1157831730829
O16 - DPF: {644E432F-49D3-41A1-8DD5-E099162EEEC5} (Symantec RuFSI Utility Class) - http://security.symantec.com/sscv6/SharedContent/common/bin/cabsa.cab
O23 - Service: ewido anti-spyware 4.0 guard - Anti-Malware Development a.s. - C:\Programmi\ewido anti-spyware 4.0\guard.exe

grazie per i consigli