Ho fatto una scansione online sul sito di Kaspersky, questo è quello che mi ha trovato

codice:
Scan Statistics
Total number of scanned objects 	144141
Number of viruses found 	4
Number of infected objects 	6 / 0
Number of suspicious objects 	6
Duration of the scan process 	01:51:59

Infected Object Name 	Virus Name 	Last Action
C:\Documents and Settings\Admin\Cookies\index.dat 	Object is locked 	skipped
C:\Documents and Settings\Admin\Dati applicazioni\Symantec\PendingAlertsQueue.log 	Object is locked 	skipped
C:\Documents and Settings\Admin\Impostazioni locali\Cronologia\History.IE5\index.dat 	Object is locked 	skipped
C:\Documents and Settings\Admin\Impostazioni locali\Dati applicazioni\Microsoft\Windows\UsrClass.dat 	Object is locked 	skipped
C:\Documents and Settings\Admin\Impostazioni locali\Dati applicazioni\Microsoft\Windows\UsrClass.dat.LOG 	Object is locked 	skipped
C:\Documents and Settings\Admin\Impostazioni locali\Temp\Perflib_Perfdata_c20.dat 	Object is locked 	skipped
C:\Documents and Settings\Admin\Impostazioni locali\Temporary Internet Files\Content.IE5\index.dat 	Object is locked 	skipped
C:\Documents and Settings\Admin\NTUSER.DAT 	Object is locked 	skipped
C:\Documents and Settings\Admin\ntuser.dat.LOG 	Object is locked 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Common Client\Confid.log 	Object is locked 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Common Client\Content.log 	Object is locked 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Common Client\Privacy.log 	Object is locked 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Common Client\Restrict.log 	Object is locked 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Common Client\settings.dat 	Object is locked 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Common Client\WebHist.log 	Object is locked 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\HPPAppActivity.log 	Object is locked 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\HPPHomePageActivity.log 	Object is locked 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Norton AntiVirus\Quarantine\2CD92A7B.tif 	Suspicious: Exploit.Win32.IMG-WMF 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Norton AntiVirus\Quarantine\331A232B.par/bpkr.exe 	Infected: Trojan-Spy.Win32.Perfloger.a 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Norton AntiVirus\Quarantine\331A232B.par 	RAR: infected - 1 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Norton AntiVirus\Quarantine\331A232B.par 	CryptFF: infected - 1 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Norton AntiVirus\Quarantine\35410818.tif 	Suspicious: Exploit.Win32.IMG-WMF 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Norton AntiVirus\Quarantine\415E1351.tif 	Suspicious: Exploit.Win32.IMG-WMF 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Norton AntiVirus\Quarantine\49611280.tif 	Suspicious: Exploit.Win32.IMG-WMF 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Norton AntiVirus\Quarantine\50482B05.exe 	Infected: Backdoor.Win32.Messo.10 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Norton AntiVirus\Quarantine\505C26EF.exe 	Infected: Backdoor.Win32.Messo.10 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Norton AntiVirus\Quarantine\547852F6.tif 	Suspicious: Exploit.Win32.IMG-WMF 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Norton AntiVirus\Quarantine\61284340.tif 	Suspicious: Exploit.Win32.IMG-WMF 	skipped
C:\Documents and Settings\All Users\Dati applicazioni\Symantec\Norton AntiVirus\Quarantine\6E437DD1.tmp 	Infected: Trojan-Downloader.Win32.Bagle.at 	skipped
C:\Documents and Settings\LocalService\Cookies\index.dat 	Object is locked 	skipped
C:\Documents and Settings\LocalService\Impostazioni locali\Cronologia\History.IE5\index.dat 	Object is locked 	skipped
C:\Documents and Settings\LocalService\Impostazioni locali\Dati applicazioni\Microsoft\Windows\UsrClass.dat 	Object is locked 	skipped
C:\Documents and Settings\LocalService\Impostazioni locali\Dati applicazioni\Microsoft\Windows\UsrClass.dat.LOG 	Object is locked 	skipped
C:\Documents and Settings\LocalService\Impostazioni locali\Temporary Internet Files\Content.IE5\index.dat 	Object is locked 	skipped
C:\Documents and Settings\LocalService\NTUSER.DAT 	Object is locked 	skipped
C:\Documents and Settings\LocalService\ntuser.dat.LOG 	Object is locked 	skipped
C:\Documents and Settings\NetworkService\Impostazioni locali\Dati applicazioni\Microsoft\Windows\UsrClass.dat 	Object is locked 	skipped
C:\Documents and Settings\NetworkService\Impostazioni locali\Dati applicazioni\Microsoft\Windows\UsrClass.dat.LOG 	Object is locked 	skipped
C:\Documents and Settings\NetworkService\NTUSER.DAT 	Object is locked 	skipped
C:\Documents and Settings\NetworkService\ntuser.dat.LOG 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\AntiSpam\Log\Spam.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\CCPD-LC\symlcrst.dll 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SNDALRT.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SNDCON.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SNDDBG.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SNDFW.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SNDIDS.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SNDSYS.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\BBConfig.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\BBDebug.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\BBDetect.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\BBNotify.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\BBRefr.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\BBSetCfg.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\BBSetCfg2.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\BBSetDev.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\BBSetLoc.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\BBSetUsr.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\BBSMNot.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\BBSMReg.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\BBSMRSt.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\BBStHash.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\BBStMSI.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\BBValid.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\SPPolicy.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\SPStart.log 	Object is locked 	skipped
C:\Programmi\File comuni\Symantec Shared\SPBBC\LOGS\SPStop.log 	Object is locked 	skipped
C:\Programmi\MySQL\MySQL Server 4.1\data\ibdata1 	Object is locked 	skipped
C:\Programmi\MySQL\MySQL Server 4.1\data\ib_logfile0 	Object is locked 	skipped
C:\Programmi\MySQL\MySQL Server 4.1\data\ib_logfile1 	Object is locked 	skipped
C:\Programmi\MySQL\MySQL Server 4.1\data\jh5dm787cct13gu.err 	Object is locked 	skipped
C:\Programmi\Norton Internet Security\Norton AntiVirus\AVApp.log 	Object is locked 	skipped
C:\Programmi\Norton Internet Security\Norton AntiVirus\AVError.log 	Object is locked 	skipped
C:\Programmi\Norton Internet Security\Norton AntiVirus\AVVirus.log 	Object is locked 	skipped
C:\Programmi\Norton Internet Security\Norton AntiVirus\Savrt\0188NAV~.TMP 	Object is locked 	skipped
C:\Programmi\Norton Internet Security\Norton AntiVirus\Savrt\0763NAV~.TMP 	Object is locked 	skipped
C:\System Volume Information\MountPointManagerRemoteDatabase 	Object is locked 	skipped
C:\System Volume Information\_restore{67B18959-A2DE-41B3-AB5D-FBD05F016A21}\RP67\change.log 	Object is locked 	skipped
C:\WINDOWS\Debug\PASSWD.LOG 	Object is locked 	skipped
C:\WINDOWS\SchedLgU.Txt 	Object is locked 	skipped
C:\WINDOWS\SoftwareDistribution\ReportingEvents.log 	Object is locked 	skipped
C:\WINDOWS\Sti_Trace.log 	Object is locked 	skipped
C:\WINDOWS\system32\CatRoot2\edb.log 	Object is locked 	skipped
C:\WINDOWS\system32\CatRoot2\tmp.edb 	Object is locked 	skipped
C:\WINDOWS\system32\config\AppEvent.Evt 	Object is locked 	skipped
C:\WINDOWS\system32\config\default 	Object is locked 	skipped
C:\WINDOWS\system32\config\default.LOG 	Object is locked 	skipped
C:\WINDOWS\system32\config\SAM 	Object is locked 	skipped
C:\WINDOWS\system32\config\SAM.LOG 	Object is locked 	skipped
C:\WINDOWS\system32\config\SecEvent.Evt 	Object is locked 	skipped
C:\WINDOWS\system32\config\SECURITY 	Object is locked 	skipped
C:\WINDOWS\system32\config\SECURITY.LOG 	Object is locked 	skipped
C:\WINDOWS\system32\config\software 	Object is locked 	skipped
C:\WINDOWS\system32\config\software.LOG 	Object is locked 	skipped
C:\WINDOWS\system32\config\SysEvent.Evt 	Object is locked 	skipped
C:\WINDOWS\system32\config\system 	Object is locked 	skipped
C:\WINDOWS\system32\config\system.LOG 	Object is locked 	skipped
C:\WINDOWS\system32\h323log.txt 	Object is locked 	skipped
C:\WINDOWS\system32\wbem\Repository\FS\INDEX.BTR 	Object is locked 	skipped
C:\WINDOWS\system32\wbem\Repository\FS\INDEX.MAP 	Object is locked 	skipped
C:\WINDOWS\system32\wbem\Repository\FS\MAPPING.VER 	Object is locked 	skipped
C:\WINDOWS\system32\wbem\Repository\FS\MAPPING1.MAP 	Object is locked 	skipped
C:\WINDOWS\system32\wbem\Repository\FS\MAPPING2.MAP 	Object is locked 	skipped
C:\WINDOWS\system32\wbem\Repository\FS\OBJECTS.DATA 	Object is locked 	skipped
C:\WINDOWS\system32\wbem\Repository\FS\OBJECTS.MAP 	Object is locked 	skipped
C:\WINDOWS\Temp\ib86 	Object is locked 	skipped
C:\WINDOWS\Temp\ib87 	Object is locked 	skipped
C:\WINDOWS\Temp\ib88 	Object is locked 	skipped
C:\WINDOWS\wiadebug.log 	Object is locked 	skipped
C:\WINDOWS\wiaservc.log 	Object is locked 	skipped
C:\WINDOWS\WindowsUpdate.log 	Object is locked 	skipped
Scan process completed.
Che devo fare ?