Per favore potreste controllarmi il log, ho trovato degli intrusi:

Logfile of HijackThis v1.99.1
Scan saved at 11.16.47, on 15/07/05
Platform: Windows 98 SE (Win9x 4.10.2222A)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

Running processes:
C:\WINDOWS\SYSTEM\KERNEL32.DLL
C:\WINDOWS\SYSTEM\MSGSRV32.EXE
C:\WINDOWS\SYSTEM\MPREXE.EXE
C:\WINDOWS\SYSTEM\mmtask.tsk
C:\PROGRAMMI\NETWORK ASSOCIATES\VIRUSSCAN\AVSYNMGR.EXE
C:\WINDOWS\SYSTEM\MSTASK.EXE
C:\PROGRAMMI\FILE COMUNI\EPSON\EBAPI\SAGENT2.EXE
C:\WINDOWS\SYSTEM\KB891711\KB891711.EXE
C:\WINDOWS\EXPLORER.EXE
C:\WINDOWS\SYSTEM\TAPISRV.EXE
C:\PROGRAMMI\NETWORK ASSOCIATES\VIRUSSCAN\VSSTAT.EXE
C:\WINDOWS\SYSTEM\SYSTRAY.EXE
C:\WINDOWS\TASKMON.EXE
C:\WINDOWS\SYSTEM\STIMON.EXE
C:\WINDOWS\RUNDLL32.EXE
C:\PROGRAMMI\NETWORK ASSOCIATES\VIRUSSCAN\AVCONSOL.EXE
C:\PROGRAMMI\STOPDIALERS\STOPDIALER.EXE
C:\WINDOWS\SYSTEM\SPOOL32.EXE
C:\WINDOWS\SYSTEM\WMIEXE.EXE
C:\PROGRAMMI\NETWORK ASSOCIATES\VIRUSSCAN\VSHWIN32.EXE
C:\PROGRAMMI\INTERNET EXPLORER\IEXPLORE.EXE
C:\WINDOWS\SYSTEM\TXTUSER.EXE
C:\PROGRAMMI\NUOVA CARTELLA (2)\HIJAK\HIJACKTHIS.EXE

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.pandasoftware.com/activescan/it/activescan_principal.htm
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
R3 - URLSearchHook: FiltURL Class - {5038FED1-CEFE-11D2-9E74-00A0C945A948} - C:\PROGRA~1\NETEX\URLSEA~1.DLL
O3 - Toolbar: &WebTrad - {7056E733-8C57-4E4E-9085-E50DE6F3374E} - C:\PROGRAMMI\EXPERT SYSTEM\PLANETGATE\IEETRADBANDS.DLL
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\SYSTEM\MSDXM.OCX
O4 - HKLM\..\Run: [SystemTray] SysTray.Exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\WINDOWS\SYSTEM\QTTASK.EXE" -atboottime
O4 - HKLM\..\Run: [ScanRegistry] C:\WINDOWS\scanregw.exe /autorun
O4 - HKLM\..\Run: [TaskMonitor] C:\WINDOWS\taskmon.exe
O4 - HKLM\..\Run: [LoadPowerProfile] Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
O4 - HKLM\..\Run: [CriticalUpdate] C:\WINDOWS\SYSTEM\wucrtupd.exe -startup
O4 - HKLM\..\Run: [StillImageMonitor] C:\WINDOWS\SYSTEM\STIMON.EXE
O4 - HKLM\..\Run: [AdslTaskBar] rundll32.exe stmctrl.dll,TaskBar
O4 - HKLM\..\RunServices: [McAfeeVirusScanService] C:\Programmi\Network Associates\VirusScan\AVSYNMGR.EXE
O4 - HKLM\..\RunServices: [LoadPowerProfile] Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
O4 - HKLM\..\RunServices: [SchedulingAgent] mstask.exe
O4 - HKLM\..\RunServices: [SAgent2ExePath] C:\Programmi\File comuni\EPSON\EBAPI\SAgent2.exe
O4 - HKLM\..\RunServices: [KB891711] C:\WINDOWS\SYSTEM\KB891711\KB891711.EXE
O4 - Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office\OSA9.EXE
O4 - Startup: Stop Dialers.lnk = C:\Programmi\StopDialers\StopDialer.exe
O4 - Startup: EPSON Status Monitor 3 Environment Check 2.lnk = C:\WINDOWS\SYSTEM\E_SRCV02.EXE
O8 - Extra context menu item: &Add animation to IncrediMail Style Box - C:\PROGRA~1\INCRED~2\bin\resources\WebMenuImg.htm
O14 - IERESET.INF: START_PAGE_URL=http://gw.aliceadsl.it/home
O16 - DPF: {644E432F-49D3-41A1-8DD5-E099162EEEC5} (Symantec RuFSI Utility Class) - http://security.symantec.com/sscv6/SharedContent/common/bin/cabsa.cab
O16 - DPF: {2BC66F54-93A8-11D3-BEB6-00105AA9B6AE} (Symantec AntiVirus scanner) - http://security.symantec.com/sscv6/SharedContent/vc/bin/AvSniff.cab
O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://www.pandasoftware.com/activescan/as5/asinst.cab

Grazie

Ciao ,
esegui queste operazioni

riavvia in modalità provvisoria, leggi qui come fare
http://www.aiutamici.com/software/view.asp?tipo=home&CodSw=344&SH=N

apri HIJAC THIS ed elimina come indicato in questo articolo
http://www.aiutamici.com/software/descrizione.asp?CodSw=1175
le righe che seguono, (nel caso le righe da eliminare non compaiono in modalità provvisoria, eliminale dalla modalità normale e riavvia il computer).

==================================
R3 - URLSearchHook: FiltURL Class - {5038FED1-CEFE-11D2-9E74-00A0C945A948} - C:\PROGRA~1\NETEX\URLSEA~1.DLL
O3 - Toolbar: &WebTrad - {7056E733-8C57-4E4E-9085-E50DE6F3374E} - C:\PROGRAMMI\EXPERT SYSTEM\PLANETGATE\IEETRADBANDS.DLL
==================================

Con la funzione TROVA di Windows, cerca ed elimina questi file,

==================================
URLSEA~1.DLL
IEETRADBANDS.DLL
==================================


Vai a PANNELLO DI CONTROLLO e clicca su OPZIONI INTERNET
nella finestra che si apre clicca i tre pulsanti
ELIMINA COOKIES - ELIMINA FILE - CANCELLA CRONOOLOGIA


al termine utilizza i programmi AD-AWARE e SPYBOT indicati in questo articolo
http://www.aiutamici.com/software/view.asp?tipo=home&CodSw=388&SH=N

sempre in modalità provvisoria fai una scansione Antivirus.

Nel tuo sistema manca un programma Firewall, installa questo
http://www.aiutamici.com/software/view.asp?tipo=home&CodSw=56

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Collaboratore Aiutamici

Il log e pulito.

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Collaboratore Aiutamici