Win2003 loses AD user account

From: Mike (mikeg452_at_hotmail.com)
Date: 09/28/05 

Date: Wed, 28 Sep 2005 08:39:58 +0200

My client has a Win2003 file/print server with SP1 and latest updates. AD,
DNS + DHCP installed and configured. It is the only domain controller on the
network. All workstations run WinXP SP2. It uses the standard "default
domain policy" installed with AD.

PROBLEM
1 x Winxp machine keeps on losing its network shares (these are
administrative shares).
When this happens the data gets "deleted" from the server. The LAN settings
gets disabled (No TCP/IP or Client for Mic Net)
The "change" and "Network ID" buttons are disabled.
The user account in Active Directory is deleted

I have tried the following
1. Rebuild user domain profile on wks, to no success
2. Reinstalled AD + rejoined all wks to domain
3. No errors in Event log as to why this happens. In Security log it show
that aco*** was removed by administrator. But no one has administrator
password and wks are not setup with admin rights.
4. Tried: Different NIC, Power Supply, another WinXP pc (different model as
to those on site), different power point, Network point and UTP flylead
5. Scanned for viruses using Trend, McAfee = pc was clean (as well as
domain)
6. Scanned for spyware and malware = pc clean (as well as domain)

If anyone can assist with this it would greatly be appreciated. (Ek is
raadop)

Thanks
Mike