Hmm weird, the windows disc should have the drivers at hand to set it going.
I don't know about PC's that old, but does it have a bios you can go into to change the boot order for example, making the cdrom load first?
Next go here:
Download the one appropiate to the windows you want to install, or just a standard boot disc which will contain cd rom drivers needed, and the operations to boot up to the windows cd. You'll need a floppy disc drive though, but I expect that PC to have one.
I hope this helps