I found this on the update site..
When searching for available updates on the Update site, you see the
0x800A01AD error while looking for updates
Problem description
This error message may occur if you have insufficient permissions to the
Windows Update registry keys. The WindowsUpdate.log file will also read
errors 0x80070005 and 0x80080005.
Applicable operating systems
a.. Windows XP
b.. Windows Server 2003
Resolutions
1. Check permissions on the Windows Update registry key
1.. Click Start.
2.. Choose Run.
3.. In the Run box, type REGEDIT.
4.. Click OK. The Registry Editor opens.
*WARNING*
Using Registry Editor incorrectly can cause serious problems that
may require you to reinstall your operating system. Microsoft cannot
guarantee that problems resulting from the incorrect use of Registry Editor
can be solved. Use Registry Editor at your own risk.
5.. Navigate to the following key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate.
6.. On the menu, click Edit. Click Permissions.
7.. For Administrator and System, select the Allow check boxes next
to Full Control and Read permissions. NOTE: In certain instances, these
check boxes are grayed out. Ensure all accounts have appropriate
permissions.
8.. Click Apply.
9.. Click OK.
10.. Close the Registry Editor.
11.. Restart the system.