We have about 8 out of 30 computers in a lab stuck on the "Zenworks imaging windows agent is now finalizing...." windows. It sits in the top left corner and will not go away. We left it running over night and it's still there. Any suggestions?

These are older P4 machines with 256-512 Ram,and Windows XP Pro on them.

We pushed out the Zenworks agent via a GPO. We stopped the GPO for now, but these machines will not finish the install process. We've tried safe mode and other things, but can't seem to find a solution.