When installing a set of programs, I have gotten this same error for
the last 2 years.  This machine is brand new, and NU System Works 2004
was the first thing installed.  What happens is I will click on a
shortcut to run the program, then the installer window pops up trying
to install microsoft office or some other program (which are already
installed). I must click cancel several times ie:8 then it will
install. Is this an undetected virus or a Win 2K glitch??

It is not an error , MS Office does by default not install itself
completely and sometimes needs additional information/programs let it
finish and it should go away , or re-install office using the custom
selection and select all to be installed on disc ,not on demand

Hope this helps you