Ciao Alfonso,
Ti invio il log di Hijack This per un controllo.
Logfile of HijackThis v1.99.1
Scan saved at 7.02.35, on 11/09/05
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:\WINDOWS\SYSTEM\MSTASK.EXE
C:\PROGRAMMI\ALWIL SOFTWARE\AVAST4\ASHSERV.EXE
C:\PROGRAMMI\EXECUTIVE SOFTWARE\DISKEEPERLITE\DKSERVICE.EXE
C:\PROGRAMMI\SYGATE\SPF\SMC.EXE
C:\WINDOWS\SYSTEM\KB891711\KB891711.EXE
C:\WINDOWS\EXPLORER.EXE
C:\WINDOWS\TASKMON.EXE
C:\PROGRAMMI\FILE COMUNI\ADAPTEC SHARED\CREATECD\CREATECD50.EXE
C:\PROGRAMMI\ADAPTEC\EASY CD CREATOR 5\DIRECTCD\DIRECTCD.EXE
C:\WINDOWS\SYSTEM\STIMON.EXE
C:\WINDOWS\RUNDLL32.EXE
C:\PROGRAMMI\CREATIVE\PC-CAM CENTER\CAMTRAY.EXE
C:\WINDOWS\LOADQM.EXE
C:\PROGRAMMI\ALWIL SOFTWARE\AVAST4\ASHMAISV.EXE
C:\WINDOWS\SYSTEM\QTTASK.EXE
C:\PROGRAMMI\ALWIL SOFTWARE\AVAST4\ASHWEBSV.EXE
C:\WINDOWS\STARTER.EXE
C:\WINDOWS\SYSTEM\SYSTRAY.EXE
C:\PROGRAMMI\MSN MESSENGER\MSNMSGR.EXE
C:\PROGRAMMI\SKYPE\PHONE\SKYPE.EXE
C:\WINDOWS\SYSTEM\CTFMON.EXE
C:\PROGRAMMI\ADOBE\ACROBAT 5.0\DISTILLR\ACROTRAY.EXE
C:\WINDOWS\SYSTEM\RPCSS.EXE
C:\WINDOWS\SYSTEM\RNAAPP.EXE
C:\WINDOWS\SYSTEM\TAPISRV.EXE
C:\PROGRAMMI\INTERNET EXPLORER\IEXPLORE.EXE
D:\TEMP\HIJACKTHIS.EXE

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\PROGRAMMI\ADOBE\ACROBAT 5.0\ACROBAT\ACTIVEX\ACROIEHELPER.OCX
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHELPER.DLL
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\programmi\google\googletoolbar1.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\SYSTEM\MSDXM.OCX
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\programmi\google\googletoolbar1.dll
O4 - HKLM\..\Run: [ScanRegistry] C:\WINDOWS\scanregw.exe /autorun
O4 - HKLM\..\Run: [TaskMonitor] C:\WINDOWS\taskmon.exe
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: [LoadPowerProfile] Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
O4 - HKLM\..\Run: [StillImageMonitor] C:\WINDOWS\SYSTEM\STIMON.EXE
O4 - HKLM\..\Run: [AdslTaskBar] rundll32.exe stmctrl.dll,TaskBar
O4 - HKLM\..\Run: [Creative WebCam Tray] C:\Programmi\Creative\PC-CAM Center\CAMTRAY.EXE
O4 - HKLM\..\Run: [LoadQM] loadqm.exe
O4 - HKLM\..\Run: [ashMaiSv] C:\PROGRA~1\ALWILS~1\AVAST4\ashmaisv.exe
O4 - HKLM\..\Run: [Tweak UI] RUNDLL32.EXE TWEAKUI.CPL,TweakMeUp
O4 - HKLM\..\Run: [QuickTime Task] "C:\WINDOWS\SYSTEM\QTTASK.EXE" -atboottime
O4 - HKLM\..\Run: [SmcService] C:\PROGRA~1\SYGATE\SPF\SMC.EXE -startgui
O4 - HKLM\..\Run: [CriticalUpdate] C:\WINDOWS\SYSTEM\wucrtupd.exe -startup
O4 - HKLM\..\Run: [avast! Web Scanner] C:\PROGRA~1\ALWILS~1\AVAST4\ASHWEBSV.EXE
O4 - HKLM\..\Run: [EnsoniqMixer] C:\WINDOWS\starter.exe
O4 - HKLM\..\Run: [SystemTray] SysTray.Exe
O4 - HKLM\..\RunServices: [LoadPowerProfile] Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
O4 - HKLM\..\RunServices: [SchedulingAgent] mstask.exe
O4 - HKLM\..\RunServices: [avast!] C:\Programmi\Alwil Software\Avast4\ashServ.exe
O4 - HKLM\..\RunServices: [DkService] C:\Programmi\Executive Software\DiskeeperLite\DkService.exe
O4 - HKLM\..\RunServices: [SmcService] C:\PROGRAMMI\SYGATE\SPF\SMC.EXE
O4 - HKLM\..\RunServices: [KB891711] C:\WINDOWS\SYSTEM\KB891711\KB891711.EXE
O4 - HKCU\..\Run: [msnmsgr] "C:\PROGRAMMI\MSN MESSENGER\MSNMSGR.EXE" /background
O4 - HKCU\..\Run: [Skype] "C:\PROGRAMMI\SKYPE\PHONE\SKYPE.EXE" /nosplash /minimized
O4 - HKCU\..\Run: [ctfmon.exe] ctfmon.exe
O4 - Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office10\OSA.EXE
O4 - Startup: Acrobat Assistant.lnk = C:\Programmi\Adobe\Acrobat 5.0\Distillr\AcroTray.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: &Google Search - res://C:\PROGRAMMI\GOOGLE\GOOGLETOOLBAR1.DLL/cmsearch.html
O8 - Extra context menu item: Cac&hed Snapshot of Page - res://C:\PROGRAMMI\GOOGLE\GOOGLETOOLBAR1.DLL/cmcache.html
O8 - Extra context menu item: Si&milar Pages - res://C:\PROGRAMMI\GOOGLE\GOOGLETOOLBAR1.DLL/cmsimilar.html
O8 - Extra context menu item: Backward &Links - res://C:\PROGRAMMI\GOOGLE\GOOGLETOOLBAR1.DLL/cmbacklinks.html
O8 - Extra context menu item: Translate into English - res://C:\PROGRAMMI\GOOGLE\GOOGLETOOLBAR1.DLL/cmtrans.html
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.5.0_04\bin\npjpi150_04.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.5.0_04\bin\npjpi150_04.dll
O12 - Plugin for .spop: C:\PROGRA~1\INTERN~1\Plugins\NPDocBox.dll
O16 - DPF: {644E432F-49D3-41A1-8DD5-E099162EEEC5} (Symantec RuFSI Utility Class) - http://security.symantec.com/sscv6/SharedContent/common/bin/cabsa.cab
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=36467&clcid=0x409
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn.com/download/MsnMessengerSetupDownloader.cab
O16 - DPF: {F2A84794-EE6D-447B-8C21-3BA1DC77C5B4} (SDKInstall Class) - http://activex.microsoft.com/activex/controls/sdkupdate/sdkinst.cab
O16 - DPF: {0A5FD7C5-A45C-49FC-ADB5-9952547D5715} (Creative Software AutoUpdate) - http://www.creative.com/su/ocx/15009/CTSUEng.cab
O16 - DPF: {F6ACF75C-C32C-447B-9BEF-46B766368D29} (Creative Software AutoUpdate Support Package) - http://www.creative.com/su/ocx/15010/CTPID.cab
O16 - DPF: {2BC66F54-93A8-11D3-BEB6-00105AA9B6AE} (Symantec AntiVirus scanner) - http://security.symantec.com/sscv6/SharedContent/vc/bin/AvSniff.cab
O17 - HKLM\System\CCS\Services\VxD\MSTCP: Domain = tin.it
O17 - HKLM\System\CCS\Services\VxD\MSTCP: NameServer = 62.211.69.150,212.48.4.15

Ciao alfonso,
Ho fatto tutto quello che tu mi hai segnalato.IL problema rimane.
Per quanto riguarda Skype devo dirti che questo programma ha sempre funzionato bene e per il passato non avevo il messaggio di errore Tapisrv.
Ciao
Gennaro

Ciao Alfonso,
Ti invio il contenuto del msgbox
TAPISRV ha provocato un errore di pagina non valida nel
modulo RPCRT4.DLL in 019f:7fba3574.
Registri:
EAX=00000001 CS=019f EIP=7fba3574 EFLGS=00010287
EBX=80000048 SS=01a7 ESP=0204ff80 EBP=0204ffcc
ECX=00000008 DS=01a7 ESI=00421430 FS=80ef
EDX=819b0d18 ES=01a7 EDI=819b0d10 GS=0000
Byte all'indirizzo CS:EIP:
8b 73 10 bd 98 3a 00 00 81 c6 b4 00 00 00 ff 73
Immagine dello stack:
0204ffcc 819b0d10 00421430 8199f4f4 7fbae7d6 80000048 00000008 bff88f20 00421430 819b0d10 00000008 8199f4f4 00000007 0204ffa4 0204fdb0 ffffffff
Ciao
Gennaro

Ciao Alfonso,
Ho controllato la versione Windows installer.
La versione è: 2.00.2600.2
Ciao
gennaro