Windows Update Troubleshooter
http://v4.windowsupdate.microsoft.com/troubleshoot/
When trying to access the Windows Update Website you receive “Administrator only”
error message WinXP only
http://support.microsoft.com/default...b;EN-US;316524
"Administrators Only" Error Message When You Attempt to Use the Windows Update Site
WinXP Home & WinXP Pro, Windows XP Tablet PC Edition, Windows XP Media Center
Edition, Windows Server 2003
Another cause for Administrator only message can occur if a program on your computer
is intercepting the Windows Update process.
It may be worth checking out this article
http://support.microsoft.com/default...b;en-us;241234
"lnl" <> wrote in message
news:BDBDF2F6-7D26-46D4-A442-...
> After trying to search for available updates, I get an error message telling
> me that I must be logged on as an administrator or a member of an
> Administrator's group in order to install items from Windows Update. I am
> logged on as the administrator of my computer and my computer is not
> connected to a network. I'm using XP home.
>
> Help, please.