I have been trying to use it with Windows 8. I have it set up running in compatibilty mode for XP SP3. It will run good for a few minutes, but within 5 minutes it will start bogging down real bad. Looking at my processor status, it shows one processor at 100% and the rest at 0. When i first load, it seems to share the processors evenly. I was trying this on my main desktop. I gave up and went back to my laptop.