ciao!
ho sempre avuto antivir pe free come antivirus ed anche ora mi funziona alla grande con l'ombrello bianco su sfondo rosso ben aperto..ma..da oggi mi e' apparsa nella sys tray l'avviso del centro sicurezza pc di win,ho xp pro ed serv pack 3..,che non ho un antivirus installato..
in poche parole e' come se tale centro sicurezza non mi rilevasse piu' la presenza di antivir..
cosa puo' esser successo..??!!
..cosa devo fare..??!!
grazie in anticipo..!!

ecco il log hijackthis..:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 17.59.13, on 05/04/2010
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:\Programmi\Avira\AntiVir Desktop\sched.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\Spyware Terminator\SpywareTerminatorShield.exe
C:\Programmi\Avira\AntiVir Desktop\avgnt.exe
C:\Programmi\File comuni\Real\Update_OB\realsched.exe
C:\Programmi\The Weather Channel FW\Desktop\DesktopWeather.exe
C:\Programmi\uTorrent\uTorrent.exe
C:\Programmi\Spyware Terminator\SpywareTerminatorUpdate.exe
C:\Programmi\Avira\AntiVir Desktop\avguard.exe
C:\Programmi\Diskeeper Corporation\Diskeeper\DkService.exe
C:\Programmi\isposure\IsposureAgent.exe
C:\Programmi\Java\jre6\bin\jqs.exe
C:\Programmi\Nitro PDF\Professional\NitroPDFDriverService.exe
C:\WINDOWS\system32\NLSSRV32.EXE
C:\Programmi\Spyware Terminator\sp_rsser.exe
C:\Programmi\isposure\IsposureAgent.exe
C:\WINDOWS\system32\wscntfy.exe
C:\WINDOWS\system32\wbem\wmiapsrv.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\rundll32.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\WINDOWS\system32\notepad.exe
C:\Documents and Settings\Administrator\Desktop\antivirus-spyware\HiJackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://www.crawler.com/search/dispat...=%s&tbid=60076
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.yahoo.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,SearchAssistant = http://www.crawler.com/search/ie.aspx?tb_id=60076
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,CustomizeSearch = http://dnl.crawler.com/support/sa_cu...spx?TbId=60076
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
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = http://www.crawler.com/search/ie.aspx?tb_id=60076
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch = http://dnl.crawler.com/support/sa_cu...spx?TbId=60076
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://windowsupdate.microsoft.com/
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
R3 - URLSearchHook: (no name) - {1CB20BF0-BBAE-40A7-93F4-6435FF3D0411} - C:\Programmi\Crawler\ctbr.dll
O2 - BHO: btorbit.com - {000123B4-9B42-4900-B3F7-F4B073EFC214} - C:\Programmi\Orbitdownloader\orbitcth.dll
O2 - BHO: (no name) - {1CB20BF0-BBAE-40A7-93F4-6435FF3D0411} - C:\Programmi\Crawler\ctbr.dll
O2 - BHO: RealPlayer Download and Record Plugin for Internet Explorer - {3049C3E9-B461-4BC5-8870-4C09146192CA} - C:\Documents and Settings\All Users\Dati applicazioni\Real\RealPlayer\BrowserRecordPlugin\I E\rpbrowserrecordplugin.dll
O2 - BHO: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
O2 - BHO: Search Helper - {6EBF7485-159F-4bff-A14F-B9E3AAC4465B} - C:\Programmi\Microsoft\Search Enhancement Pack\Search Helper\SEPsearchhelperie.dll
O2 - BHO: Guida per l'accesso a Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Programmi\File comuni\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: (no name) - {B922D405-6D13-4A2B-AE89-08A030DA4402} - (no file)
O2 - BHO: WOT Helper - {C920E44A-7F78-4E64-BDD7-A57026E7FEB7} - C:\Programmi\WOT\WOT.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
O2 - BHO: (no name) - {E312764E-7706-43F1-8DAB-FCDD2B1E416D} - (no file)
O2 - BHO: JQSIEStartDetectorImpl - {E7E6F031-17CE-4C07-BC86-EABFE594F69C} - C:\Programmi\Java\jre6\lib\deploy\jqs\ie\jqs_plugi n.dll
O3 - Toolbar: Grab Pro - {C55BBCD6-41AD-48AD-9953-3609C48EACC7} - C:\Programmi\Orbitdownloader\GrabPro.dll
O3 - Toolbar: Toolbar &Crawler - {4B3803EA-5230-4DC3-A7FC-33638F3D3542} - C:\Programmi\Crawler\ctbr.dll
O3 - Toolbar: WOT - {71576546-354D-41c9-AAE8-31F2EC22BF0D} - C:\Programmi\WOT\WOT.dll
O3 - Toolbar: (no name) - {B922D405-6D13-4A2B-AE89-08A030DA4402} - (no file)
O3 - Toolbar: &Windows Live Toolbar - {21FA44EF-376D-4D53-9B0F-8A89D3229068} - C:\Programmi\Windows Live\Toolbar\wltcore.dll
O4 - HKLM\..\Run: [SpywareTerminator] "C:\Programmi\Spyware Terminator\SpywareTerminatorShield.exe"
O4 - HKLM\..\Run: [avgnt] "C:\Programmi\Avira\AntiVir Desktop\avgnt.exe" /min
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [TkBellExe] "C:\Programmi\File comuni\Real\Update_OB\realsched.exe" -osboot
O4 - HKCU\..\Run: [DW6] "C:\Programmi\The Weather Channel FW\Desktop\DesktopWeather.exe"
O4 - HKCU\..\Run: [uTorrent] "C:\Programmi\uTorrent\uTorrent.exe"
O4 - HKCU\..\Run: [SpywareTerminatorUpdate] "C:\Programmi\Spyware Terminator\SpywareTerminatorUpdate.exe"
O4 - HKUS\S-1-5-21-436374069-616249376-725345543-1008\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'eMule_Secure')
O4 - HKUS\S-1-5-21-436374069-616249376-725345543-1008\..\Run: [eMuleAutoStart] C:\Programmi\eMule\emule.exe -AutoStart (User 'eMule_Secure')
O4 - HKUS\S-1-5-21-436374069-616249376-725345543-1008\..\RunOnce: [NeroHomeFirstStart] "C:\Programmi\File comuni\Nero\Lib\NMFirstStart.exe" (User 'eMule_Secure')
O8 - Extra context menu item: &Download by Orbit - res://C:\Programmi\Orbitdownloader\orbitmxt.dll/201
O8 - Extra context menu item: &Grab video by Orbit - res://C:\Programmi\Orbitdownloader\orbitmxt.dll/204
O8 - Extra context menu item: Crawler Search - tbr:iemenu
O8 - Extra context menu item: Do&wnload selected by Orbit - res://C:\Programmi\Orbitdownloader\orbitmxt.dll/203
O8 - Extra context menu item: Down&load all by Orbit - res://C:\Programmi\Orbitdownloader\orbitmxt.dll/202
O9 - Extra button: Inserisci blog - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Programmi\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra 'Tools' menuitem: Inserisci &blog in Windows Live Writer - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Programmi\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra button: (no name) - {85d1f590-48f4-11d9-9669-0800200c9a66} - C:\WINDOWS\system32\shdocvw.dll
O9 - Extra 'Tools' menuitem: Uninstall BitDefender Online Scanner v8 - {85d1f590-48f4-11d9-9669-0800200c9a66} - C:\WINDOWS\system32\shdocvw.dll
O9 - Extra button: (no name) - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search & Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O16 - DPF: {56762DEC-6B0D-4AB4-A8AD-989993B5D08B} (OnlineScanner Control) - http://www.eset.eu/buxus/docs/OnlineScanner.cab
O16 - DPF: {5AE58FCF-6F6A-49B2-B064-02492C66E3F4} (MUCatalogWebControl Class) - http://catalog.update.microsoft.com/...?1235630691343
O16 - DPF: {7530BFB8-7293-4D34-9923-61A11451AFC5} (OnlineScanner Control) - http://download.eset.com/special/eos/OnlineScanner.cab
O16 - DPF: {8FEFF364-6A5F-4966-A917-A3AC28411659} (SopCore Control) - http://www.telepace.it/scripts/sopcore.cab
O16 - DPF: {BDBDE413-7B1C-4C68-A8FF-C5B2B4090876} (F-Secure Online Scanner 3.3) - http://support.f-secure.com/ols/fscax.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/ge...sh/swflash.cab
O16 - DPF: {E2883E8F-472F-4FB0-9522-AC9BF37916A7} - http://platformdl.adobe.com/NOS/getPlusPlus/1.6/gp.cab
O18 - Protocol: tbr - {4D25FB7A-8902-4291-960E-9ADA051CFBBF} - C:\Programmi\Crawler\ctbr.dll
O18 - Protocol: wot - {C2A44D6B-CB9F-4663-88A6-DF2F26E4D952} - C:\Programmi\WOT\WOT.dll
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: ATI Smart - Unknown owner - C:\WINDOWS\system32\ati2sgag.exe
O23 - Service: Diskeeper - Diskeeper Corporation - C:\Programmi\Diskeeper Corporation\Diskeeper\DkService.exe
O23 - Service: IsposureAgent (isposure_svc) - Epitiro Ltd. - C:\Programmi\isposure\IsposureAgent.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Programmi\Java\jre6\bin\jqs.exe
O23 - Service: Nero BackItUp Scheduler 3 - Nero AG - C:\Programmi\Nero\Nero8\Nero BackItUp\NBService.exe
O23 - Service: NitroPDFDriverCreatorReadSpool (NitroDriverReadSpool) - Nitro PDF Software - C:\Programmi\Nitro PDF\Professional\NitroPDFDriverService.exe
O23 - Service: NLS Service (nlsX86cc) - Nalpeiron Ltd. - C:\WINDOWS\system32\NLSSRV32.EXE
O23 - Service: Remote Packet Capture Protocol v.0 (experimental) (rpcapd) - CACE Technologies, Inc. - C:\Programmi\WinPcap\rpcapd.exe
O23 - Service: Spyware Terminator Realtime Shield Service (sp_rssrv) - Crawler.com - C:\Programmi\Spyware Terminator\sp_rsser.exe

--
End of file - 9899 bytes

luca

Il tuo sistema non è protetto da un Firewall, installane uno il prima possibile, ti consiglio Outpost

Per quanto riguarda Antivir, prova a disinstallarlo e reinstalarlo nuovamente

fai una scansione antivirus in Modalità Provvisoria.

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alfonso_aiutamici@hotmail.it