windows update

hi good day!
When i attempt to use the Windows Update site, i receive an error
message:

Administrators Only (-2146828218) To install items from Windows Update, you
must be logged on as an administrator or a member of the Administrators
group. If your computer is connected to a network, network policy settings
may also prevent you from completing this procedure.

i received this message even though i am already logged on as an
administrator or a member of the Administrators group.
any help would be great. tnx