In reply to FesteringSore:
came from the other thread...
right so you have the CD's that it came with?
i'm not great with windows 8 as i don't have a copy so the exact method will be slightly different
put the cd in... it may well auto run... close the autorun program.
using windows explorer, locate your computers cd drive, right click on the drive and in the pop up context menu select "explore" or "browse"
hopefully there should be a file on the CD called something like "setup.exe"
right click on that and in the context menu click "properties"
this should open a dialogue box with some tabs along the top, click on the tab that says compatibliity. there should be a "wizard" that will help you choose the best version of windows you want it to pretend to be.
as a warning it might turn out to be a bit more colicated than this... there is another way which i'll post an overview of next