Windows 2000 Advanced Server, GPO, Windows XP sp2 client

I create an Organizational Unit on active directory users and computer(windows 2000 advanced server)…, after editing and assigning policies to the user created under Organizational Unit….., As I log on to Windows 2000 advanced server (I used the user account which I created under OU) the policy applies…., but when I log in to the workstation (windows xp client ) using that account, the policy does not apply… Help po!