When uninstalling Exchange 2000 I got the following prompt appear:
Every I clicked on in the showed the following error:
Setup failed while (error 0x8000FFFF: An unexpected error occurred.) .
An unexpected error occurred.
ID no: 8000ffff
Microsoft Exchange Setup
I have uninstalled Exchange 2000 many times through Add and Remove programs and never had this before - really weird. The fix for this was to run the exchange setup application of the exchange 2000 CD under D:\Setup\i386\setup.exe, and selecting remove for all exchange components. Maybe the installation files on drive c: were corrupt?