I'm using XP and don't have any problem. Try with compatibility mode for launcher if you have Vista/7 (Properties on file -> Compatibility tab -> check Run this program in compatibility mode for - Windows XP -> OK).
Another cool thing is that you can set Disabled for slots and you'll have how many Computers do you want on. Lovin' it!
Another cool thing is that you can set Disabled for slots and you'll have how many Computers do you want on. Lovin' it!