spero di aver fatto bene.
Ecco il log:

Logfile of HijackThis v1.98.2
Scan saved at 14.19.32, on 11/09/04
Platform: Windows 98 SE (Win9x 4.10.2222A)
MSIE: Internet Explorer v6.00 (6.00.2600.0000)

Running processes:
C:\WINDOWS\SYSTEM\KERNEL32.DLL
C:\WINDOWS\SYSTEM\MSGSRV32.EXE
C:\WINDOWS\SYSTEM\MPREXE.EXE
C:\WINDOWS\SYSTEM\mmtask.tsk
C:\WINDOWS\SYSTEM\MSTASK.EXE
C:\WINDOWS\EXPLORER.EXE
C:\WINDOWS\TASKMON.EXE
C:\WINDOWS\SYSTEM\SYSTRAY.EXE
C:\WINDOWS\SYSTEM\ATIPTAXX.EXE
C:\WINDOWS\SM56HLPR.EXE
C:\PROGRAMMI\CREATIVE\SBLIVE\AUDIOHQ\AHQTB.EXE
C:\PROGRAMMI\CREATIVE\LAUNCHER\CTLAUNCHER.EXE
C:\WINDOWS\SYSTEM\STIMON.EXE
C:\WINDOWS\SYSTEM\RNAAPP.EXE
C:\PROGRAMMI\REAL\REALPLAYER\REALPLAY.EXE
C:\PROGRAMMI\SCANSOFT\OMNIPAGESE\OPWARE32.EXE
C:\WINDOWS\SYSTEM\QTTASK.EXE
C:\PROGRAMMI\THOMSON\SPEEDTOUCH USB\DRAGDIAG.EXE
C:\WINDOWS\APPLICATION DATA\UOCA.EXE
C:\WINDOWS\SYSTEM\DHJXDGSL.EXE
C:\PROGRAMMI\MICROSOFT OFFICE\OFFICE\FINDFAST.EXE
C:\PROGRAMMI\MICROSOFT OFFICE\OFFICE\OSA.EXE
C:\WINDOWS\SYSTEM\TAPISRV.EXE
C:\WINDOWS\SYSTEM\DDHELP.EXE
C:\WINDOWS\SYSTEM\PSTORES.EXE
C:\WINDOWS\SYSTEM\WMIEXE.EXE
C:\WINDOWS\DESKTOP\HIJACKTHIS\HIJACKTHIS.EXE
C:\PROGRAMMI\INTERNET EXPLORER\IEXPLORE.EXE

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = Microsoft Internet Explorer
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
F1 - win.ini: run=hpfsched
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\PROGRAMMI\ADOBE\ACROBAT 5.0\READER\ACTIVEX\ACROIEHELPER.OCX
O2 - BHO: Curl - {A78CC2FF-6E4E-4556-B27C-D7C3A70D7A50} - C:\WINDOWS\SYSTEM\NDRV.DLL (file missing)
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\SYSTEM\MSDXM.OCX
O4 - HKLM\..\Run: [ScanRegistry] C:\WINDOWS\scanregw.exe /autorun
O4 - HKLM\..\Run: [TaskMonitor] C:\WINDOWS\taskmon.exe
O4 - HKLM\..\Run: [SystemTray] SysTray.Exe
O4 - HKLM\..\Run: [LoadPowerProfile] Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
O4 - HKLM\..\Run: [Atikey] Atitask.exe
O4 - HKLM\..\Run: [AtiCwd32] Aticwd32.exe
O4 - HKLM\..\Run: [AtiQiPcl] AtiQiPcl.exe
O4 - HKLM\..\Run: [AtiPTA] Atiptaxx.exe
O4 - HKLM\..\Run: [SM56ACL] sm56hlpr.exe
O4 - HKLM\..\Run: [Disc Detector] C:\Programmi\Creative\ShareDLL\CtNotify.exe
O4 - HKLM\..\Run: [AudioHQ] C:\Programmi\Creative\SBLive\AudioHQ\AHQTB.EXE
O4 - HKLM\..\Run: [Creative Launcher] C:\Programmi\Creative\Launcher\CTLauncher.exe
O4 - HKLM\..\Run: [StillImageMonitor] C:\WINDOWS\SYSTEM\STIMON.EXE
O4 - HKLM\..\Run: [RealTray] C:\Programmi\Real\RealPlayer\RealPlay.exe SYSTEMBOOTHIDEPLAYER
O4 - HKLM\..\Run: [Omnipage] C:\Programmi\ScanSoft\OmniPageSE\opware32.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\WINDOWS\SYSTEM\QTTASK.EXE" -atboottime
O4 - HKLM\..\Run: [mdac_runonce] C:\WINDOWS\SYSTEM\runonce.exe
O4 - HKLM\..\Run: [SpeedTouch USB Diagnostics] "C:\Programmi\Thomson\SpeedTouch USB\Dragdiag.exe" /icon
O4 - HKLM\..\Run: [QTSvc] C:\WINDOWS\shman.exe /i
O4 - HKLM\..\RunServices: [LoadPowerProfile] Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
O4 - HKLM\..\RunServices: [SchedulingAgent] mstask.exe
O4 - HKCU\..\Run: [Lewt] C:\WINDOWS\Application Data\uoca.exe
O4 - HKCU\..\Run: [ClockSync] "C:\Programmi\ClockSync\Sync.exe" /q
O4 - HKCU\..\Run: [Sjs] C:\WINDOWS\SYSTEM\dhjxdgsl.exe
O4 - Startup: Ricerca rapida.lnk = C:\Programmi\Microsoft Office\Office\FINDFAST.EXE
O4 - Startup: Avvio Office.lnk = C:\Programmi\Microsoft Office\Office\OSA.EXE
O9 - Extra button: (no name) - {CD67F990-D8E9-11d2-98FE-00C0F0318AFE} - (no file)
O16 - DPF: {4E330863-6A11-11D0-BFD8-006097237877} (InstallFromTheWeb ActiveX Control) - http://www.installfromtheweb.com/install/iftwclix.cab
O16 - DPF: {FE8287E9-5F43-11D3-ABCA-00105A5C1F46} (HouseCall Control) - http://antivirus.interfree.it/xscan52.cab
O16 - DPF: {AB1E62EB-3DE3-428F-A417-64AB3C9B6CF0} - http://econnect.libereco.net/econnect.cab
O16 - DPF: {FFFF0049-0001-101A-A3C9-08002B2F49FB} - http://66.240.179.128/73a26235.exe
O16 - DPF: {F281A59C-7B65-11D3-8617-0010830243BD} (Controllo AcPreview) - file://C:\Programmi\AutoCAD LT 2000i Ita\AcPreview.ocx
O16 - DPF: {78AF2F24-A9C3-11D3-BF8C-0060B0FCC122} (Controllo AcDc oggi) - file://C:\Programmi\AutoCAD LT 2000i Ita\AcDcToday.ocx
O16 - DPF: {1F831FA9-42FC-11D4-95A6-0080AD30DCE1} (InstaFred Control) - file://C:\Programmi\AutoCAD LT 2000i Ita\InstFred.ocx
O16 - DPF: {74D05D43-3236-11D4-BDCD-00C04F9A3B61} (Damage Cleanup Server Control) - http://213.158.72.33/housecall/xscan53.cab
O17 - HKLM\System\CCS\Services\VxD\MSTCP: Domain = clubnet.tin.it
O17 - HKLM\System\CCS\Services\VxD\MSTCP: NameServer = 212.216.112.222,212.216.172.162