I will try to make as much sense of this that I can. I just started maintaining a small network which has a Windows 2003 server and 5 workstations. I haven't had the opportunity yet to fully dig into how their server was configure by the previous administrator.
I recently added a new laptop to the domain with a new user. I added the domain admin AND the new domain user as a local administrator on the laptop through the Control Panel>User Accounts interface. A couple days later the user was unable to download and update Flash, insufficient privileges. I noticed he was no longer a local admin on the laptop, neither was the domain admin. I added both the domain admin and the new domain user as administrators again on the local machine and all was well. A couple days later, again the user could not perform certain actions. And again the settings in the User Accounts did not retain.
What could be causing this? Is it a GPO on the server?
Any advice would be appreciated.