Other Thoughts: I have a 3.2mhz XP laptop w/1GB ram. Program virtually locks up the computer for about a minute while it loads, then severely lags every time you attempt to make a mouse selection. My guess is you need a dual-core 3-4GB ram minimum to run this. Why bother, there are many other virtual drum programs available that don't at this way. I strongly recommend the developer rewrite the way this program handles memory - it is "virtually" useless.