Users computer slow after join domain

Hi,

Please help.

My office using Windows server standard 2003 R3 SP2 and the users use Windows XP SP3 Pro.

Recently i join all the users in our office to the server domain for global password policy settings. I create their user in the Active Directory and use that user to logon to their computer/laptop.

After join domain the computer all the user having problem, their computer become slow on a fix time everyday

E.g. : some computer become slow at 4.30 PM, or other computer become slow at 7.00PM

Before join the server domain there is no slow problem. Any solution for this problem.

Kindly help. Thanks.