gentilissimo Alfonso,
questo il mio log, ma, ti prego, dimmi come mai si è aperto con excell e non con il solito word?
grazie

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Logfile of HijackThis v1.99.1
Scan saved at 17.23.57, on 21/09/05
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\ALWIL SOFTWARE\AVAST4\ASHSERV.EXE
C:\WINDOWS\SYSTEM\KB891711\KB891711.EXE
C:\WINDOWS\SYSTEM\MSTASK.EXE
C:\PROGRAMMI\EXECUTIVE SOFTWARE\DISKEEPERLITE\DKSERVICE.EXE
C:\PROGRAMMI\WEBSVR\SISTEMA\INETSW95.EXE
C:\WINDOWS\EXPLORER.EXE
C:\WINDOWS\SYSTEM\RNAAPP.EXE
C:\WINDOWS\SYSTEM\TAPISRV.EXE
C:\WINDOWS\SYSTEM\RPCSS.EXE
C:\WINDOWS\TASKMON.EXE
C:\WINDOWS\SYSTEM\SYSTRAY.EXE
C:\WINDOWS\STARTER.EXE
C:\WINDOWS\SYSTEM\ATIPTAXX.EXE
C:\PROGRAMMI\ALWIL SOFTWARE\AVAST4\ASHWEBSV.EXE
C:\PROGRAMMI\ALWIL SOFTWARE\AVAST4\ASHMAISV.EXE
C:\WINDOWS\SYSTEM\STIMON.EXE
C:\PROGRAMMI\SLIPSTREAM WEB ACCELERATOR\SLIPCORE.EXE
C:\PROGRAMMI\FILE COMUNI\ADAPTEC SHARED\CREATECD\CREATECD50.EXE
C:\PROGRAMMI\ADAPTEC\EASY CD CREATOR 5\DIRECTCD\DIRECTCD.EXE
C:\PROGRAMMI\YAHOO!\MESSENGER\YPAGER.EXE
C:\PROGRAMMI\SLIPSTREAM WEB ACCELERATOR\SLIPGUI.EXE
C:\PROGRAMMI\STOPDIALERS\STOPDIALERS.EXE
C:\WINDOWS\SYSTEM\SPOOL32.EXE
C:\WINDOWS\SYSTEM\WMIEXE.EXE
C:\WINDOWS\SYSTEM\E_S10IC2.EXE
C:\PROGRAMMI\INTERNET EXPLORER\IEXPLORE.EXE
C:\WINDOWS\SYSTEM\DDHELP.EXE
C:\WINDOWS\DESKTOP\HIJACKTHIS LOG.EXE

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://arianna.libero.it
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.libero.it/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.libero.it
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = Microsoft Internet Explorer
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyServer = http=127.0.0.1:5400
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: Yahoo! Companion BHO - {02478D38-C3F9-4efb-9B51-7695ECA05670} - C:\PROGRAMMI\YAHOO!\COMPANION\INSTALLS\CPN\YCOMP5_6_2_0.DLL
O2 - BHO: PBlockHelper Class - {4115122B-85FF-4DD3-9515-F075BEDE5EB5} - C:\PROGRAMMI\SLIPSTREAM WEB ACCELERATOR\PBHELPER.DLL
O3 - Toolbar: SlipStream Web Accelerator - {8B79EE88-E62D-4AA8-B530-CC357BA112B7} - C:\PROGRAMMI\SLIPSTREAM WEB ACCELERATOR\TOOLBAND.DLL
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\SYSTEM\MSDXM.OCX
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\PROGRAMMI\YAHOO!\COMPANION\INSTALLS\CPN\YCOMP5_6_2_0.DLL
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: [EnsoniqMixer] starter.exe
O4 - HKLM\..\Run: [AtiPTA] Atiptaxx.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\..\Run: [StillImageMonitor] C:\WINDOWS\SYSTEM\STIMON.EXE
O4 - HKLM\..\Run: [CriticalUpdate] C:\WINDOWS\SYSTEM\wucrtupd.exe -startup
O4 - HKLM\..\Run: [LoadPowerProfile] Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
O4 - HKLM\..\Run: [SlipStream] "C:\Programmi\SlipStream Web Accelerator\slipcore.exe"
O4 - HKLM\..\Run: [Microsoft WebServer] C:\Programmi\WebSvr\Sistema\svctrl /init
O4 - HKLM\..\Run: [CreateCD50] "C:\Programmi\File comuni\Adaptec Shared\CreateCD\CreateCD50.exe" -r
O4 - HKLM\..\Run: [AdaptecDirectCD] "C:\Programmi\Adaptec\Easy CD Creator 5\DirectCD\DirectCD.exe"
O4 - HKLM\..\Run: [Outpost Firewall] C:\PROGRA~1\AGNITUM\OUTPOS~1.0\OUTPOST.EXE /waitservice
O4 - HKLM\..\RunServices: [avast!] C:\Programmi\Alwil Software\Avast4\ashServ.exe
O4 - HKLM\..\RunServices: [KB891711] C:\WINDOWS\SYSTEM\KB891711\KB891711.EXE
O4 - HKLM\..\RunServices: [LoadPowerProfile] Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
O4 - HKLM\..\RunServices: [SchedulingAgent] C:\WINDOWS\SYSTEM\mstask.exe
O4 - HKLM\..\RunServices: [DkService] C:\Programmi\Executive Software\DiskeeperLite\DkService.exe
O4 - HKLM\..\RunServices: [Microsoft WebServer] C:\Programmi\WebSvr\Sistema\inetsw95.exe -w3svc
O4 - HKCU\..\Run: [Yahoo! Pager] "C:\Programmi\Yahoo!\Messenger\ypager.exe" -quiet
O4 - Startup: EPSON Status Monitor 3 Environment Check 2.lnk = C:\WINDOWS\SYSTEM\E_SRCV02.EXE
O4 - Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office\OSA9.EXE
O4 - Startup: SlipStream Web Accelerator.lnk = C:\Programmi\SlipStream Web Accelerator\slipgui.exe
O4 - Startup: Stop Dialers.lnk = C:\Programmi\StopDialers\StopDialers.exe
O8 - Extra context menu item: Scarica con Download &Express - C:\Programmi\Download Express\Add_Url.htm
O8 - Extra context menu item: Mostra immagine originale - res://C:\PROGRAMMI\SLIPSTREAM WEB ACCELERATOR\GUI_RESOURCE.DLL/328
O8 - Extra context menu item: Mostra tutte le immagini originali - res://C:\PROGRAMMI\SLIPSTREAM WEB ACCELERATOR\GUI_RESOURCE.DLL/327
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: Browser Adjustment - {44627E97-789B-40d4-B5C2-58BD171129A1} - C:\PROGRAMMI\AGNITUM\OUTPOST FIREWALL 1.0\PLUGINS\BROWSERBAR\IE_BAR.DLL (file missing)
O9 - Extra button: Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - C:\PROGRAMMI\YAHOO!\COMMON\YHEXBMESIT.DLL
O9 - Extra 'Tools' menuitem: Yahoo! Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - C:\PROGRAMMI\YAHOO!\COMMON\YHEXBMESIT.DLL
O14 - IERESET.INF: START_PAGE_URL=http://www.libero.it
O16 - DPF: {30528230-99f7-4bb4-88d8-fa1d4f56a2ab} (YInstStarter Class) - C:\Programmi\Yahoo!\Common\yinsthelper.dll

gentilissimo Alfonso,
ho fatto scrupolosamente quanto mi hai detto e per ora tutto bene.
grazie.
gerione