OK it is quite simple. I had the error "missing device driver" on 2 of my rigs I tried everything to get Windows 8 Pro to install on them and it came to me to install Windows 7 on the partition I wanted to install 8 on and just try to install it over it. Sure enough it worked with no issues. Also I have told other about this (some was having the save error as I was and other had different ones) and to my knowledge it has a 100% success rate. It does not cause any problems with dual/triple booting either. I already had Windows 7 Ultimate is my ACTIVE partition and XP Pro as my 2nd. I can easily boot from XP,7 and 8 flawlessly. Yes this will take a few minutes but at least it will work with no errors. Hope this helps some of you guys/gals that don't know a whole lot about this kind of stuff.