@ avast@ advantage77.com, Arnold72,
Well, as many of the newer systems available now have UEFI boot protocol, and if you have one of those systems, you will not be able to downgrade to Win 7, Win Vista, or XP, as none of these os's support UEFI boot.
Should point out that, major vendors will not, and do not, support a downgrade on an os on a fresh and new machine that comes with Win 8, and has the old BIOS boot format.
Need drivers for that old os for that new specific machine? You likely won't find any at the manufacturer vendor site if it is UEFI.
As this is a bit off topic (OT) back to the OP here.
EDIT: You can PM me if you wish to continue this UEFI discussion there.