GP problem

I have a Windows 2000Sp4 server network with windows XP Pro SP2 workstations. Set GP for OU in active directory for screensaver password protect. Works on all except 1 XP machine. When I run gpresult I get “policy object does not exist”. Did some reserach and the only thing I could find dealt with FRS. I completed the registry fix for Enable Journal Wrap Automatic Restore, but problem still exist. Does anyone have any ideas other then reimage the HDD? Thanks.