soliti problemi di connessione..ecco il log, per favore dateci un occhiata.
Logfile of HijackThis v1.98.2
Scan saved at 9.22.53, on 15/06/05
Platform: Windows 98 SE (Win9x 4.10.2222A)
MSIE: Internet Explorer v5.00 (5.00.2919.6304)

Running processes:
C:\WINDOWS\SYSTEM\KERNEL32.DLL
C:\WINDOWS\SYSTEM\MSGSRV32.EXE
C:\WINDOWS\SYSTEM\MPREXE.EXE
C:\WINDOWS\SYSTEM\mmtask.tsk
C:\PROGRAMMI\ALWIL SOFTWARE\AVAST4\ASHSERV.EXE
C:\WINDOWS\TASKMON.EXE
C:\WINDOWS\SYSTEM\SYSTRAY.EXE
C:\PROGRAMMI\MATROX MGA POWERDESK\MGACTRL.EXE
C:\PROGRAMMI\MATROX MGA POWERDESK\COLOR\HGCCTL95.EXE
C:\PROGRAMMI\LOGITECH\MOUSEWARE\SYSTEM\EM_EXEC.EXE
C:\WINDOWS\RUNDLL32.EXE
C:\PROGRAMMI\USB 2.0 FLASH DRIVE UTILITY\PLBKMON.EXE
C:\PROGRAMMI\ALWIL SOFTWARE\AVAST4\ASHWEBSV.EXE
C:\PROGRAMMI\ALWIL SOFTWARE\AVAST4\ASHMAISV.EXE
C:\WINDOWS\SYSTEM\RPCSS.EXE
C:\WINDOWS\SYSTEM\WMIEXE.EXE
C:\WINDOWS\SYSTEM\DDHELP.EXE
C:\WINDOWS\EXPLORER.EXE
C:\PROGRAMMI\WINZIP\WINZIP32.EXE
C:\WINDOWS\TEMP\HIJACKTHIS.EXE

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.it/
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: IeCatch2 Class - {A5366673-E8CA-11D3-9CD9-0090271D075B} - C:\PROGRAMMI\FLASHGET\JCCATCH.DLL
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\PROGRAMMI\ADOBE\ACROBAT 6.0\READER\ACTIVEX\ACROIEHELPER.DLL
O2 - BHO: CDllBho Object - {5A5B6916-ED71-4531-8018-E792DD44156E} - C:\WINDOWS\DD.DLL
O3 - Toolbar: @msdxmLC.dll,-1@1040,&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: [Matrox Control Center] C:\Programmi\Matrox MGA PowerDesk\mgactrl.exe
O4 - HKLM\..\Run: [Matrox Color Control] C:\Programmi\Matrox MGA PowerDesk\Color\hgcctl95.exe
O4 - HKLM\..\Run: [Matrox Diagnostic] C:\Programmi\Matrox MGA PowerDesk\diag\mgadiag.exe -s
O4 - HKLM\..\Run: [EM_EXEC] C:\PROGRA~1\LOGITECH\MOUSEW~1\SYSTEM\EM_EXEC.EXE
O4 - HKLM\..\Run: [LoadPowerProfile] Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
O4 - HKLM\..\Run: [AdslTaskBar] rundll32.exe stmctrl.dll,TaskBar
O4 - HKLM\..\Run: [TSE_PLUtil] C:\Programmi\USB 2.0 Flash Drive Utility\PLBkMon.exe
O4 - HKLM\..\Run: [avast! Web Scanner] C:\PROGRA~1\ALWILS~1\AVAST4\ASHWEBSV.EXE
O4 - HKLM\..\Run: [ashMaiSv] C:\PROGRA~1\ALWILS~1\AVAST4\ashmaisv.exe
O4 - HKLM\..\RunServices: [LoadPowerProfile] Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
O4 - HKLM\..\RunServices: [avast!] C:\Programmi\Alwil Software\Avast4\ashServ.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~1\OFFICE10\EXCEL.EXE/3000
O8 - Extra context menu item: Scarica con FlashGet - C:\PROGRAMMI\FLASHGET\jc_link.htm
O8 - Extra context menu item: Scarica tutto con FlashGet - C:\PROGRAMMI\FLASHGET\jc_all.htm
O9 - Extra button: Related - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINDOWS\web\related.htm
O9 - Extra 'Tools' menuitem: Show &Related Links - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINDOWS\web\related.htm
O9 - Extra button: FlashGet - {D6E814A0-E0C5-11d4-8D29-0050BA6940E3} - C:\PROGRAMMI\FLASHGET\FLASHGET.EXE
O9 - Extra 'Tools' menuitem: &FlashGet - {D6E814A0-E0C5-11d4-8D29-0050BA6940E3} - C:\PROGRAMMI\FLASHGET\FLASHGET.EXE
O12 - Plugin for .pdf: C:\PROGRA~1\INTERN~1\PLUGINS\nppdf32.dll
O14 - IERESET.INF: SEARCH_PAGE_URL=
O14 - IERESET.INF: START_PAGE_URL=
O16 - DPF: {EFB22865-F3BC-4309-ADFA-C8E078A7F762} (SysWebTelecomInt Class) - http://www.sponsoradulto.com/cab/14/en/SysWebTelecomInt.cab
O16 - DPF: {11111111-1111-1111-1111-111191113457} - file://c:\ied_s7.cab
O16 - DPF: {11111111-1111-1111-1111-511111193457} - file://c:\x.cab
O16 - DPF: {11111111-1111-1111-1111-511111193458} - file://c:\x.cab
O16 - DPF: {56336BCB-3D8A-11D6-A00B-0050DA18DE71} (RdxIE Class) - http://software-dl.real.com/13ff987c00e7b44d4921/netzip/RdxIE601_it.cab
O16 - DPF: {24311111-1111-1121-1111-111191113457} - file://c:\eied_s7.cab
O16 - DPF: {33331111-1111-1111-1111-611111193458} - file://c:\ex.cab

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).

==================================
O2 - BHO: CDllBho Object - {5A5B6916-ED71-4531-8018-E792DD44156E} - C:\WINDOWS\DD.DLL
-
O16 - DPF: {EFB22865-F3BC-4309-ADFA-C8E078A7F762} (SysWebTelecomInt Class) - http://www.sponsoradulto.com/cab/14/en/SysWebTelecomInt.cab
O16 - DPF: {11111111-1111-1111-1111-111191113457} - file://c:\ied_s7.cab
O16 - DPF: {11111111-1111-1111-1111-511111193457} - file://c:\x.cab
O16 - DPF: {11111111-1111-1111-1111-511111193458} - file://c:\x.cab
O16 - DPF: {56336BCB-3D8A-11D6-A00B-0050DA18DE71} (RdxIE Class) - http://software-dl.real.com/13ff987c00e7b44d4921/netzip/RdxIE601_it.cab
O16 - DPF: {24311111-1111-1121-1111-111191113457} - file://c:\eied_s7.cab
O16 - DPF: {33331111-1111-1111-1111-611111193458} - file://c:\ex.cab
==================================

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

==================================
DD.DLL
ied_s7.cab
x.cab
eied_s7.cab
ex.cab
==================================


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

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Collaboratore Aiutamici