When my Windows computer given up the ghost, I was looking for an alternative solution to from time to time small Windows programs run! Since I did not always have my Mac drive up and down just because a program, I decided for Parallels Desktop 5 and have not been disappointed. Although the applications do not run as fast as when you start Windows in Boot Camp but for my use absolutely ok. Would like for someone who not only Windows programs run constantly, this program is perfect!