Windows Update

Windows Update no longer allows me to update. I receive [Error number:
0x8DDD0002]
And the message
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 the administrator and have never had problems with update until recently.

Any help would be greatly appreciated.
Thanks
Dan