Sorry, I had posted this in the wrong section!

I have a little problem: I have a lot of workstations full of "unknown users".
I explain: an authorized user log on in one fo my workstations, and automatically windows create his "Profile User Folder:. ok?
But when the user change, and the account is deleted on the PDC, exist a way to search and delete this "user unknown"?

I think that the "unknown" attribute is given by an interrogation to the PDC from the client,so the solution is not in the System Registry ... I think ...

Can someone help me?
As everytime ... Thanks for everything!