Windows XP Professional x64 Version 5.2

Windows XP Professional x64
Version 5.2 (Build 3790.srv03_sp1_rtm.050324-1447 : Service Pack 1)

I am unable to receive updates from Microsoft Update, am receiveing the
following error.

"To install updates from this website, you must be logged on as an
administrator or a member of the Administrators group on your computer. If
you use Windows XP, you can see if you are an administrator by going to User
Accounts in Control Panel."
>>> I am logged in as administrator

Note: If your computer is connected to a network, network policy settings
might also prevent you using this website. Contact your system administrator
for help with updates.
>>> The policy settings are set correctly, and have even double checked the
>>> registry settings to ensure there is not an option issue.

I have searched through the posts here a bit, I do not believe this is a
beta OS, and I am still assumeing that this OS is still on the Windows Update
list. I may be wrong, but so far I have not found an answer to correct the
issue or tell me it is no longer supported.

Any help would be appreciated,
Thank you