I got a problem since a while with my XP client connected on a 2003 R2 Server Active Directory.

Sometime GPO doesn't load when a user log on. Some other time, It work.

I search many time on google to find a solution about that problem but I never found one.

I look for DNS but it doesn't seems to be the issue there.

Is anyone already encountered this problem before?

Thanks for you precious answer it's been several months I'm searching for a solution since this problem happen in a school environnement so this is really important that GPO apply correctly everytime!

EDIT : Problem still not solved, did what all of you said but doesn't help... I'll check it out on monday when I'll go back to work.

EDIT : I'm still searching for a solution on this, suggested solution up to now still not resolved the problem. Thanks however for those ;)