Ok alfonso, ecco il log del mio PC:

Logfile of HijackThis v1.99.1
Scan saved at 09:12:32, on 09.10.05
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\SPOOL32.EXE
C:\WINDOWS\SYSTEM\MPREXE.EXE
C:\WINDOWS\SYSTEM\MSTASK.EXE
C:\WINDOWS\SYSTEM\ATI2EVXX.EXE
c:\windows\SYSTEM\KB891711\KB891711.EXE
C:\WINDOWS\SYSTEM\mmtask.tsk
C:\WINDOWS\EXPLORER.EXE
C:\WINDOWS\WINS.EXE
C:\WINDOWS\TASKMON.EXE
C:\WINDOWS\SYSTEM\SYSTRAY.EXE
C:\WINDOWS\SYSTEM\ATIPTAXX.EXE
C:\WINDOWS\SYSTEM\STIMON.EXE
C:\WINDOWS\SYSTEM32\DRIVERS\KODAKCCS.EXE
C:\WINDOWS\SYSTEM\USBMONIT.EXE
C:\PROGRAMMI\HP CD-WRITER\DIRECTCD\DIRECTCD.EXE
C:\PROGRAMMI\HP CD-WRITER\MMENU\HPCDTRAY.EXE
C:\PROGRAMMI\GRISOFT\AVG FREE\AVGCC.EXE
C:\PROGRAMMI\GRISOFT\AVG FREE\AVGEMC.EXE
C:\PROGRAMMI\GRISOFT\AVG FREE\AVGAMSVR.EXE
C:\PROGRAMMI\TRUST\SOFTWARE BLUETOOTH\BTTRAY.EXE
C:\WINDOWS\SYSTEM\WMIEXE.EXE
C:\PROGRAMMI\LOGITECH\WINGMAN SOFTWARE\LWEMON.EXE
C:\PROGRAMMI\TRUST\SOFTWARE BLUETOOTH\BTSTACKSERVER.EXE
C:\DOCUMENTI\DOWNLOAD INTERNET\HIJACK THIS\HIJACKTHIS.EXE

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.virgilio.it/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://home.netscape.com/home/winsearch200.html
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://keyword.netscape.com/keyword/:s
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = localhost
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
F1 - win.ini: run=cavo.exe
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\PROGRAMMI\ADOBE\ACROBAT 5.0\READER\ACTIVEX\ACROIEHELPER.OCX
O2 - BHO: myBar BHO - {0494D0D1-F8E0-41ad-92A3-14154ECE70AC} - C:\PROGRAMMI\MYWAY\MYBAR\1.BIN\MYBAR.DLL
O3 - Toolbar: My andSearch Bar - {0494D0D9-F8E0-41ad-92A3-14154ECE70AC} - C:\PROGRAMMI\MYWAY\MYBAR\1.BIN\MYBAR.DLL
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: [AtiPTA] Atiptaxx.exe
O4 - HKLM\..\Run: [AtiCwd32] Aticwd32.exe
O4 - HKLM\..\Run: [AtiQiPcl] AtiQiPcl.exe
O4 - HKLM\..\Run: [StillImageMonitor] C:\WINDOWS\SYSTEM\STIMON.EXE
O4 - HKLM\..\Run: [KodakCCS] c:\windows\System32\Drivers\KodakCCS.exe
O4 - HKLM\..\Run: [USBMonit.exe] "C:\WINDOWS\SYSTEM\USBMonit.exe"
O4 - HKLM\..\Run: [msgserv16_] C:\WINDOWS\SYSTEM\sys.exe
O4 - HKLM\..\Run: [Adaptec DirectCD] C:\PROGRA~1\HPCD-W~1\DIRECTCD\DIRECTCD.EXE
O4 - HKLM\..\Run: [HP CD-Writer] C:\Programmi\HP CD-Writer\Mmenu\hpcdtray.exe
O4 - HKLM\..\Run: [AVG7_CC] C:\PROGRA~1\GRISOFT\AVGFRE~1\AVGCC.EXE /STARTUP
O4 - HKLM\..\Run: [AVG7_EMC] C:\PROGRA~1\GRISOFT\AVGFRE~1\AVGEMC.EXE
O4 - HKLM\..\Run: [AVG7_AMSVR] C:\PROGRA~1\GRISOFT\AVGFRE~1\AVGAMSVR.EXE
O4 - HKLM\..\RunServices: [LoadPowerProfile] Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
O4 - HKLM\..\RunServices: [SchedulingAgent] mstask.exe
O4 - HKLM\..\RunServices: [ATIPOLAB] ati2evxx.exe
O4 - HKLM\..\RunServices: [KB891711] c:\windows\SYSTEM\KB891711\KB891711.EXE
O4 - HKCU\..\Run: [Start WingMan Profiler] "c:\Programmi\Logitech\WingMan Software\Lwtest.exe" /detect /quiet /launch "c:\Programmi\Logitech\WingMan Software\LwEmon.exe /noui"
O4 - Startup: BTTray.lnk = C:\Programmi\TRUST\Software Bluetooth\BTTray.exe
O4 - Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office\OSA9.EXE
O9 - Extra button: Real.com - {CD67F990-D8E9-11d2-98FE-00C0F0318AFE} - C:\WINDOWS\SYSTEM\Shdocvw.dll
O9 - Extra button: (no name) - {10954C80-4F0F-11d3-B17C-00C0DFE39736} - http://ricercaperfetta.com/ (file missing)
O9 - Extra 'Tools' menuitem: Loghi e suonerie - {10954C80-4F0F-11d3-B17C-00C0DFE39736} - http://ricercaperfetta.com/ (file missing)
O12 - Plugin for .wav: C:\PROGRA~1\INTERN~1\PLUGINS\npqtplugin.dll
O12 - Plugin for .mov: C:\PROGRA~1\INTERN~1\PLUGINS\npqtplugin.dll
O16 - DPF: {00000000-0000-0000-0000-000020030000} - http://tbosat.altervista.org/10423.exe
O16 - DPF: {15320607-1001-1831-1000-118599957123} - ms-its:mhtml:file://C:\PATH.MHT!http://195.225.176.5//d//nargghl//gjbyajf//ihcoslj//irkqpg//IT//arct.chm::/painter.exe
O16 - DPF: {200B3EE9-7242-4EFD-B1E4-D97EE825BA53} (VerifyGMN Class) - http://h20270.www2.hp.com/ediags/gmn/install/hpobjinstaller_gmn.cab

GRAZIE!