Restoring Trusts between client workstations and Domain Controller

Scenario: Windows 2k Advanced Server on small network of less than twenty
client workstations (WinXP Pro and Win2k Pro), running Active Directory.

A recent problem left us with corrupt operating system forcing a rebuild of
the server without the benefit of recent backup of SAM and SID's. How do I
go about restoring communication between the client workstations (they were
never disjoined from the Domain) and the newly configured Domain Controller
with Active Directroy.

The best I've been able to achieve is logon using credentials assigned to
"Active Directory Users and Computers", but Security Policies are not applied
and resources are not being shared.

A brute force method of leaving the Domain to join a workgroup, then
rejoining the Domain will work but is awfully messy and time consuming... not
to mention the loss of some user settings.

Any help is appreciated.

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