I doubt that dos will like booting windows 98 from the cd drive, especially on a possibly dud pc?
go to... http://www.bootdisk.com/bootdisk.htm
and download the appropriate windows 98 one...
your computer should run the windows 98 install and ask for the disk there, you may need to do A:\setup.exe or setup.bat whatever it is.
let me know
You sure running win 98 is a good idea on that computer? what are the specs.