Hi Dan,
People do "hijack" original posts and it's impolite to do so.
So you really want to change the engine in your car but we don't know what type of car you have.
How to Find the HP Model Number and the HP Product Number or let HP automatically find your PC model number and HP network attached printers.
Depending of the bios in your PC, it may not be possible to downgrade to Windows 7.