Error when installing Office 2000

[Sam]

I am trying to re-install Office 2000 on a Windows 2000
workstation. It previuosly had Windows 95 and Office 97
and was upgraded and the hard drive copied over to a new
machine.

Office programs (Word, Outlook) starting acting weird and
some of the icons and shortcuts were missing. When I try
to reinstall it says it finds a previous version, do I
want to upgrade. When I click yes, I get:

The system administrator has set policies to prevent this
installation.

The user is an administrator and I even logged in under
the admin account and get the same message.

There is no entry under Add/Remove programs for Office. I
tried removing using the manual method (both 97 and 2000)
from the MSKB and still get the same message.

Any suggestions would be greatly appreciated.

Thanks,
Sam