Office update failed

[Hadley]

I have MS Office 2000 and I tried to update from SR-1 to
SR-1 Professional and I was asked to insert my CD's. I
purchased my computer second hand from a school and as
such I do not have the CDs in my possession (and I am in
Europe now!). The error message I am getting is "MS Office
2000 SR-1 Professional Setup Failed."

Now, everytime I try to launch Excel, it goes into Windows
Installer mode, and then asks for the CD again in order to
install MS Office 2000 SR-1 Professional.

How do I undo this update? I really don't need it, and I
can't access my CDs.

Thanks,
Hadley