Grazie per i precedenti aiuti, credo di aver risolto il problema dei VUNDO, attivando la pulizia come suggerito da r16.
Grazie, mando i log x un controllo :

MALWAREBYTES:

Malwarebytes' Anti-Malware 1.31
Versione del database: 1513
Windows 5.1.2600 Service Pack 3

18/12/2008 16.32.15
mbam-log-2008-12-18 (16-32-05).txt

Tipo di scansione: Scansione completa (C:\|D:\|E:\|)
Elementi scansionati: 285143
Tempo trascorso: 59 minute(s), 29 second(s)

Processi delle memoria infetti: 0
Moduli della memoria infetti: 0
Chiavi di registro infette: 13
Valori di registro infetti: 1
Elementi dato del registro infetti: 0
Cartelle infette: 0
File infetti: 7

Processi delle memoria infetti:
(Nessun elemento malevolo rilevato)

Moduli della memoria infetti:
(Nessun elemento malevolo rilevato)

Chiavi di registro infette:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{e5646f36-145e-4f1d-b6d1-87c5efc5ba1c} (Trojan.Vundo) -> No action taken.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{1a26f07f-0d60-4835-91cf-1e1766a0ec56} (Trojan.Agent) -> No action taken.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\affri (Malware.Trace) -> No action taken.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\affltid (Malware.Trace) -> No action taken.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\rdfa (Trojan.Vundo) -> No action taken.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\affltid (Malware.Trace) -> No action taken.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\affri (Malware.Trace) -> No action taken.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\contim (Trojan.Vundo) -> No action taken.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\dslcnnct (Trojan.Vundo) -> No action taken.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\rdfa (Trojan.Vundo) -> No action taken.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\FCOVM (Trojan.Vundo) -> No action taken.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RemoveRP (Trojan.Vundo) -> No action taken.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\aoprndtws (Trojan.Vundo) -> No action taken.

Valori di registro infetti:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellExecuteHooks\{e5646f36-145e-4f1d-b6d1-87c5efc5ba1c} (Trojan.Vundo) -> No action taken.

Elementi dato del registro infetti:
(Nessun elemento malevolo rilevato)

Cartelle infette:
(Nessun elemento malevolo rilevato)

File infetti:
C:\WINDOWS\system32\mcrh.tmp (Malware.Trace) -> No action taken.
C:\WINDOWS\cookies.ini (Malware.Trace) -> No action taken.
C:\WINDOWS\system32\comsa32.sys (Trojan.Agent) -> No action taken.
C:\WINDOWS\pskt.ini (Trojan.Vundo) -> No action taken.
C:\WINDOWS\BMf75ceed8.xml (Trojan.Vundo) -> No action taken.
C:\WINDOWS\BMf75ceed8.txt (Trojan.Vundo) -> No action taken.
C:\WINDOWS\system32\clkcnt.txt (Trojan.Vundo) -> No action taken.


HIJACK THIS DOPO LA PULIZIA:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 17.15.39, on 18/12/2008
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16762)
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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\Programmi\Lavasoft\Ad-Aware\aawservice.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\File comuni\EPSON\EBAPI\SAgent2.exe
C:\Programmi\Java\jre6\bin\jqs.exe
c:\Programmi\Sophos\Sophos Anti-Virus\SAVAdminService.exe
c:\Programmi\Sophos\AutoUpdate\ALsvc.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\SOUNDMAN.EXE
C:\Programmi\ATI Technologies\ATI.ACE\CLI.EXE
C:\Programmi\EPSON\Creativity Suite\Event Manager\EEventManager.exe
D:\Programmi\Elaborate Bytes\VirtualCloneDrive\VCDDaemon.exe
D:\Programmi\CyberLink\PowerDVD\PDVDServ.exe
C:\Programmi\File comuni\InstallShield\UpdateService\issch.exe
C:\Programmi\Java\jre6\bin\jusched.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\File comuni\Ahead\Lib\NMBgMonitor.exe
C:\Programmi\Sophos\AutoUpdate\ALMon.exe
C:\Programmi\File comuni\Ahead\Lib\NMIndexingService.exe
C:\Programmi\File comuni\Ahead\Lib\NMIndexStoreSvr.exe
C:\Programmi\ATI Technologies\ATI.ACE\cli.exe
C:\Programmi\ATI Technologies\ATI.ACE\cli.exe
D:\Programmi\Mozilla Firefox\firefox.exe
C:\WINDOWS\system32\NOTEPAD.EXE
C:\Programmi\Trend Micro\HijackThis\HijackThis.exe

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.uniud.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
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://r.office.microsoft.com/r/rlidOfficeSearchInstallRTM?clid=1040&ver=12&app=outlook.exe&p1=32&p2=5&p3=1
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: Supporto di collegamento per Adobe PDF Reader - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\File comuni\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: Sophos Web Content Scanner - {39EA7695-B3F2-4C44-A4BC-297ADA8FD235} - c:\Programmi\Sophos\Sophos Anti-Virus\SophosBHO.dll
O2 - BHO: Java(tm) Plug-In SSV Helper - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Programmi\Java\jre6\bin\ssv.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Programmi\Java\jre6\bin\jp2ssv.dll
O2 - BHO: JQSIEStartDetectorImpl - {E7E6F031-17CE-4C07-BC86-EABFE594F69C} - C:\Programmi\Java\jre6\lib\deploy\jqs\ie\jqs_plugin.dll
O4 - HKLM\..\Run: [ATICCC] "C:\Programmi\ATI Technologies\ATI.ACE\CLIStart.exe"
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [NeroFilterCheck] C:\Programmi\File comuni\Ahead\Lib\NeroCheck.exe
O4 - HKLM\..\Run: [EEventManager] C:\Programmi\EPSON\Creativity Suite\Event Manager\EEventManager.exe
O4 - HKLM\..\Run: [VirtualCloneDrive] "D:\Programmi\Elaborate Bytes\VirtualCloneDrive\VCDDaemon.exe" /s
O4 - HKLM\..\Run: [RemoteControl] D:\Programmi\CyberLink\PowerDVD\PDVDServ.exe
O4 - HKLM\..\Run: [ISUSPM Startup] C:\PROGRA~1\FILECO~1\INSTAL~1\UPDATE~1\ISUSPM.exe -startup
O4 - HKLM\..\Run: [ISUSScheduler] "C:\Programmi\File comuni\InstallShield\UpdateService\issch.exe" -start
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Programmi\Adobe\Reader 8.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\Java\jre6\bin\jusched.exe"
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [DU Meter] C:\WINDOWS\system32\DUMeter.exe
O4 - HKCU\..\Run: [BgMonitor_{79662E04-7C6C-4d9f-84C7-88D8A56B10AA}] "C:\Programmi\File comuni\Ahead\Lib\NMBgMonitor.exe"
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVIZIO DI RETE')
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: Adobe Gamma.lnk = C:\Programmi\File comuni\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: AutoUpdate Monitor.lnk = C:\Programmi\Sophos\AutoUpdate\ALMon.exe
O4 - Global Startup: EPSON Status Monitor 3 Environment Check 2.lnk = C:\WINDOWS\system32\spool\drivers\w32x86\3\E_SRCV02.EXE
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office12\EXCEL.EXE/3000
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\Office12\REFIEBAR.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:\Programmi\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O16 - DPF: {02BF25D5-8C17-4B23-BC80-D3488ABDDC6B} (QuickTime Plugin Control) - http://appldnld.apple.com.edgesuite.net/content.info.apple.com/QuickTime/qtactivex/qtplugin.cab
O16 - DPF: {2D8ED06D-3C30-438B-96AE-4D110FDC1FB8} (ActiveScan 2.0 Installer Class) - http://www.pandasecurity.com/activescan/cabs/as2stubie.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/get/shockwave/cabs/flash/swflash.cab
O17 - HKLM\System\CCS\Services\Tcpip\Parameters: Domain = med.uniud.it
O17 - HKLM\Software\..\Telephony: DomainName = med.uniud.it
O17 - HKLM\System\CCS\Services\Tcpip\..\{3F65BBB2-0F09-4788-8583-B71A2FA91CAD}: NameServer = 158.110.1.7,130.186.1.53
O17 - HKLM\System\CS1\Services\Tcpip\Parameters: Domain = med.uniud.it
O17 - HKLM\System\CS2\Services\Tcpip\Parameters: Domain = med.uniud.it
O17 - HKLM\System\CS3\Services\Tcpip\Parameters: Domain = med.uniud.it
O20 - AppInit_DLLs: C:\PROGRA~1\KASPER~1\KASPER~1.0\adialhk.dll,c:\PROGRA~1\Sophos\SOPHOS~1\SOPHOS~1.DLL
O23 - Service: Lavasoft Ad-Aware Service (aawservice) - Lavasoft - C:\Programmi\Lavasoft\Ad-Aware\aawservice.exe
O23 - Service: Adobe LM Service - Adobe Systems - C:\Programmi\File comuni\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: ATI Smart - Unknown owner - C:\WINDOWS\system32\ati2sgag.exe
O23 - Service: EPSON Printer Status Agent2 (EPSONStatusAgent2) - SEIKO EPSON CORPORATION - C:\Programmi\File comuni\EPSON\EBAPI\SAgent2.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Programmi\Java\jre6\bin\jqs.exe
O23 - Service: NBService - Nero AG - D:\Programmi\Nero 7\Nero BackItUp\NBService.exe
O23 - Service: NMIndexingService - Nero AG - C:\Programmi\File comuni\Ahead\Lib\NMIndexingService.exe
O23 - Service: Crea report sullo stato di Sophos Anti-Virus (SAVAdminService) - Sophos Plc - c:\Programmi\Sophos\Sophos Anti-Virus\SAVAdminService.exe
O23 - Service: Sophos Anti-Virus (SAVService) - Sophos Plc - c:\Programmi\Sophos\Sophos Anti-Virus\SavService.exe
O23 - Service: Sophos AutoUpdate Service - Sophos Plc - c:\Programmi\Sophos\AutoUpdate\ALsvc.exe

--
End of file - 8127 bytes

Ciao.
Dovevi postare nello stesso TOPIC che hai aperto.
Spero che quei file, che Malwarebytes ha trovato, tu li abbia eliminati, selezionandoli e poi cliccando su Rimuovi Selezionati
Ricordati di rinascondere le cartelle di sistema;
Riattiva il ripristino configurazione di sistema e, se tutto è a posto, creane uno nuovo.
Il log di HJT è pulito.