Cannot add/remove progs after W2K reinstall

Thank you in advance for all of your help regarding this
matter.

Recently, it was necessary to re-install W2K on one of
our servers when a stop error would not permit the server
to boot.

Ever since the W2K re-install, I cannot add/remove
programs via the administrator account. The error
message that pops up when attempting to remove a program
is the following:

'The installation is forbidden by system policy. Contact
your system administrator.'

The server still has the same GPO applied to it as
before.

Has anybody had a similar problem following a W2k re-
install or have any suggestions?

Once again, all of your help is greatly appreciated by
this entry-level recent college grad.