Running Windows 7 With XP 3 sounds good, an running Windows 8 with XP 3 sounds even better... however Windows XP's interface needs better improvement to utilize the benefits of higher ram. XP will still try to default to the 2G Ram limitation. I have found the use of 2 separate HDD's with the different Windows installations do most of the job; but the ability to actually use XP programming together with later versions of Windows I have found to still be in the future.