Hello lukerussell,
Since you don't know the local admin's password, the first step you should take is to reset the local admin password. Follow this link:
http://www.petri.co.il/for
Download the tool (there is a floppy and cd version) and use it to reset the local admin password.
After you re-gain admin-level access make sure that the computer is part of your domain. If it's still in the domain, add the domain admin account to the local admin group.
If you are using GPO's and someone sets the 'restricted users' property improperly the domain admin account could be removed from the local admins group.
HTH,
William
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by: Netman66Posted on 2007-02-14 at 18:13:19ID: 18537452
Easy.
Create a temporary OU.
Move that computer into it.
In a new GPO linked to that OU you want to configure Restricted Groups like so:
Right click Restricted Groups.
Select New Group.
Browse to the Domain Admins group.
Add it.
In the next window, on the bottom half of the tab select Add beside "this group is a member of"
Manually type Administrators.
Ok your way out.
The computer should now have the Domain Admin group in the local Administrators group.
At this point you can move the computer back after resetting the local Administrator password.
If the DA group is once again removed then you can use the local Admin account to replace it.