Insufficient Permissions Error when Installing Updates

When trying to install updates on our Windows 2003 Server domain controllers, the install kept failing with an Insufficient Permissions error. This is strange since I am a Domain Admin on a Domain Controller. The fix from Microsoft was to go into the Default Domain Controller GPO under "Computer Configuration / Windows Settings / Security Settings / Local Policies / User Rights Assignment" and add the Domain Admin group to the following four policies: Restore files and directories, Manage auditing and security logs, Backup files and directories, and Take ownership of files and folders. This information has not been released yet from Microsoft into a public knowledge base article.

Networking Windows 2003 Server