NT4 Workstation: How to add Domain User to Local Admin Group

i am the sys admin for a small tax firm who has a small Windows 2000 Domain with one NT4 Workstation member.  On this particular NT4 Workstation, there is some tax software that periodically needs to connect to the internet and install some Updates.  When this happens, users are getting the following error:

The current user, UserA, is not within the administrators group.  Only users with administrator equivalent may install Tax Programs.  Please login as an administrator and restart setup.

UserA is logging onto the domain, and is in group Domain Users on the domain.  I would like to add UserA to the NT4 Local Adminisrator group, as I'm pretty sure that would resolve this issue, but can't figure out how to do this.  How do I add a domain user to local admin group?

Or is there a better way to do this?
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You need to run usrmgr on the local NT machine this is usaually accomplished by going to a dos prompt and typing usrmgr \\%computername%. This will open a domain manager for the local NT machine, add the domain user to the machine local administartors group. If you don't have usrmgr on the NT4 workstation, it should be on the NT4 cd under the I386 directory. Worst case scenerio you don't have either of these option, open a command prompt and type "net localgroup /add yourdomain\username" This will only work if you login as a domain administartor to the NT4 machine. I suggest the usrmgr scheme it's usually far simpler.

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austinringdingAuthor Commented:
ok, i downloaded UsrMgr and tried doing it through that interface, but couldn't quite figure out how to do it so I used the following command to get the job done:

net localgroup Administrators "Domain_Name\User_Name" /add

thanks for your help.
Renato Montenegro RusticiIT SpecialistCommented:
Just go to the machine and log on with an administrative user. Then, click on Start, Programs, Administrative Tools and open User Manager (a green globe).

In User Manager, look at the pane in the bottom. There is the build-in groups, which includes local Administrators group. Double click the "Administrators" group and add your user to the list.
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