I tested Clints XP and 2k3 both are excellent. I am still using his xp as my main OS and has taken everything I have thrown at it. It has been on here about a year now I have only rebooted about 5 or 6 times, then only because of installing software. I have the 2k3 installed on an old HP. 600 mhz, 64 mb ram. It has been running about 6 months without reboot which is amazing cause it is a knock around computer for kids to play games on. Kids cant make this OS stop working. His 2k I could imagine would bring new life to computers which was doomed to computer heaven.