Hi Mohamed,
Although I'm not an expert on the subject matter, because this an issue
related to Directory Service. I'll try to do my best to assist you in
troubleshooting this issue.
If you run the "net share" command, you may discover that the computer is
missing the IPC$, ADMIN$ or C$ shares. If you recreate a missing share, you
may discover that it disappears after the next startup or logon. This may
occur even if you set the AutoShareServer and AutoShareWks registry DWORD
values to 1.
245117 Administrative Shares Do Not Appear on Server
http://support.microsoft.com/?id=245117
306927 Windows 2000-Based or Windows Server 2003-Based Computer Is
Inaccessible
http://support.microsoft.com/?id=306927
Update you ant-virus software to the latest version, then scan for possible
virus which have been reported to Microsoft in the past to cause the exact
same behavior you're experiencing. You may find unknown processes that
start from the Startup folder or from the Run key in the registry.
Anti-virus software may detect viruses, worms, trojans or backdoors, or the
FTP root on a web server may be filled with unknown files.
--
Hope this helps,
Mike Rosado
Windows 2000 MCSE + MCDBA
Microsoft Enterprise Platform Support
Windows NT/2000/2003 Cluster Technologies
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