Invalid Product

[Irv]

I had office 2000 small business edition and updated it to
2000 professional. Everything works fine with the
exdception of Excel. When I try to open something that I
had created or have created by clicking on the file I get
the following message. "This action is only valid for
products that are currently installed. I uninstalled the
complete office suite, and then re-installed the
professional edition from the CD. Same problem. Does
anyone have an idea of whats going on?

Thanks
..