Automatic Office Update

I have no trouble with updates for WinXPpro, but updates for Office 2003 have
never worked. I've tried all the hints on the (manual) Office Update site;
they download but won't install. No big deal, though, Office is working fine
as-is. Seems that now I am on a 'list' for Office updates, however, so every
day Microsoft tries to update Office for me, and it fails each time. This
creates a hassle each time I boot and turn off the computer. How can I
'unsubscribe' for updates to Office, only? Thanks.