Caro Amvinfe (che nic impronuncialibe!) sei davvero gentile.
Seguendo le tue indicazioni ho letto quello che è stato sinora scritto sull'argomento e ho scaricato HijackThis.
Mi par di capire che devo che per rimuovere i
malware devo - riporto testuale da http://www.alground.com/sicurezza/articolo.php?page=16 - "mettere la spunta al fianco delle voci che si desiderano rimuovere e cliccare su "Fix checked"

ma mi chiedo - allegando qui sotto il mio log- come identifico ciò che devo rimuovere?

e altra domandina. è un'operazione che può mettere a rischio il funzionamento del pc?

grazie ancora
Roberto
------------------

Logfile of HijackThis v1.99.1
Scan saved at 12.02.42, on 11/04/2005
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\csrss.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\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\Miramar\PC MACLAN\ATMsg.exe
C:\Programmi\Miramar\PC MACLAN\ATSERVER.EXE
C:\Programmi\Miramar\PC MACLAN\ATSPOOL.EXE
C:\Programmi\Norton AntiVirus\navapsvc.exe
C:\WINDOWS\system32\wdfmgr.exe
C:\Programmi\File comuni\Symantec Shared\Security Center\SymWSC.exe
C:\WINDOWS\System32\alg.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\System32\igfxtray.exe
C:\WINDOWS\System32\hkcmd.exe
C:\Programmi\Java\j2re1.4.2_03\bin\jusched.exe
C:\PROGRA~1\NORTON~1\navapw32.exe
C:\Programmi\Daily Weather Forecast\weather.exe
C:\Programmi\Real\RealPlayer\RealPlay.exe
C:\Programmi\Java\j2re1.4.2_03\bin\javaw.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\WINDOWS\system32\notepad.exe
C:\WINDOWS\system32\wscntfy.exe
C:\Programmi\Microsoft Office\OFFICE11\WINWORD.EXE
C:\Programmi\Microsoft Office\OFFICE11\OUTLOOK.EXE
C:\PROGRA~1\WINZIP\winzip32.exe
C:\Documents and Settings\Administrator\Impostazioni locali\Temp\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = www.master69.biz?1462
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://www.fujitsu-siemens.com/
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
R3 - Default URLSearchHook is missing
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: NAV Helper - {BDF3E430-B101-42AD-A544-FADC6B084872} - C:\Programmi\Norton AntiVirus\NavShExt.dll
O3 - Toolbar: Norton AntiVirus - {42CDD1BF-3FFB-4238-8AD1-7859DF00B1D6} - C:\Programmi\Norton AntiVirus\NavShExt.dll
O4 - HKLM\..\Run: [IgfxTray] C:\WINDOWS\System32\igfxtray.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\System32\hkcmd.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Programmi\Java\j2re1.4.2_03\bin\jusched.exe
O4 - HKLM\..\Run: [Miramar Systems, Inc.] C:\Programmi\Miramar\PC MACLAN\atmsg.exe
O4 - HKLM\..\Run: [NAV Agent] C:\PROGRA~1\NORTON~1\navapw32.exe
O4 - HKLM\..\Run: [Symantec NetDriver Monitor] C:\PROGRA~1\SYMNET~1\SNDMon.exe
O4 - HKLM\..\Run: [vlhogiwi] c:\windows\system32\vlhogiwi.exe
O4 - HKLM\..\Run: [Daily Weather Forecast] C:\Programmi\Daily Weather Forecast\weather.exe
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [TrojanScanner] C:\Programmi\Trojan Remover\Trjscan.exe
O4 - HKCU\..\Run: [SpySweeper] "C:\Programmi\Webroot\Spy Sweeper\SpySweeper.exe" /0
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Programmi\File comuni\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Spy Sweeper Fix.lnk = C:\Programmi\Webroot\Spy Sweeper\SpySweeperFix.bat
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\WINDOWS\System32\msjava.dll (file missing)
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\WINDOWS\System32\msjava.dll (file missing)
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: Real.com - {CD67F990-D8E9-11d2-98FE-00C0F0318AFE} - C:\WINDOWS\system32\Shdocvw.dll
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
O14 - IERESET.INF: START_PAGE_URL=http://www.fujitsu-siemens.com
O15 - Trusted Zone: www.master69.biz
O15 - Trusted Zone: www.sgrunt.biz
O15 - Trusted Zone: www.yeak.net
O16 - DPF: {31E68DE2-5548-4B23-88F0-C51E6A0F695E} (Microsoft PID Sniffer) - https://support.microsoft.com/OAS/ActiveX/odc.cab
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://v5.windowsupdate.microsoft.co...?1104762067403
O16 - DPF: {74D05D43-3236-11D4-BDCD-00C04F9A3B61} (HouseCall Control) - http://a840.g.akamai.net/7/840/537/2...ll/xscan53.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{1B346A28-04E5-4166-8B3C-7523479A00D3}: NameServer = 151.99.0.100,151.99.125.2
O20 - Winlogon Notify: igfxcui - C:\WINDOWS\SYSTEM32\igfxsrvc.dll
O23 - Service: AppleTalk Messenger (ATMsg) - Miramar Systems Inc. - C:\Programmi\Miramar\PC MACLAN\ATMsg.exe
O23 - Service: Macromedia Licensing Service - Unknown owner - C:\Programmi\File comuni\Macromedia Shared\Service\Macromedia Licensing.exe
O23 - Service: Miramar AppleTalk File Server - Miramar Systems Inc. - C:\Programmi\Miramar\PC MACLAN\ATSERVER.EXE
O23 - Service: Miramar AppleTalk Print Server - Miramar Systems Inc. - C:\Programmi\Miramar\PC MACLAN\ATSPOOL.EXE
O23 - Service: Servizio Norton AntiVirus Auto-Protect (navapsvc) - Symantec Corporation - C:\Programmi\Norton AntiVirus\navapsvc.exe
O23 - Service: ScriptBlocking Service (SBService) - Symantec Corporation - C:\PROGRA~1\FILECO~1\SYMANT~1\SCRIPT~1\SBServ.exe
O23 - Service: Symantec Network Drivers Service (SNDSrvc) - Symantec Corporation - C:\Programmi\File comuni\Symantec Shared\SNDSrvc.exe
O23 - Service: SymWMI Service (SymWSC) - Symantec Corporation - C:\Programmi\File comuni\Symantec Shared\Security Center\SymWSC.exe