Deleting Roaming Profiles after Logoff

Any thoughts on this:

To summarise the Enviroment : Server 2k3 with Clients Windows Xp.

I have setup a group policy with?delete cached copies of roaming profiles? in ?computer config, admin templates, system, user profiles? set to enabled.The policy is applied to the client PC’s.So far so good.

I then logon and logoff as a test user on the client PC. I then logon as admin and check the test user profile but the profile is still there.

I ran ?gpupdate /force? after changing the group policy, I also rebooted the PC.The test user profile does not delete.

Any thoughts?