Problem with Setup of Office 2000

[giannis]

I have Office 2000 SR-1 Premium.
When i try run the setup.exe from the cd for add some
components (or unistall ) the system trying access
to drive a:\ and i receive the message :
"This patch package could not be opened. Verify that
the patch package exists and that you can access it,
or contact the application vendor to verify that this is
a valid Windows Installer patch package"
and the setup finished !!!
I cant unistall Office !!!
What can i do ?

Note: When i try add some components from
Word or Access i receive the message:
".........installer error 1635"