Windows XP Pro & Win Server 2003 Logon problems

Hi all,

Trying to figure a problem out.

I've set up a network of 7 PC's and a Server.

PC's are XP Pro and the server is Win Server 2003

When users log on to the domain it either works firat time and goes through in record time or they key in the password hit enter and then sit there while windows says it's applying the computer settings and then nothing happens and they have to reset the PC and try again.

They can do this 2 or 3 times when they try and logon or it will just work first time. There is no pattern to it, it just seems to be pot luck on working first time or taking server attempts.

Anyone got any ideas?

Cheers

Chris