I installed the trial version on two computers. One running Windows XP Pro SP2, and the other using Windows XP Home SP2.The Pro machine is running the software fine,but the Home machine displayed the "blue screen", when I restarted the system. I was able to remove the software after restarting in safe mode. The problem might be the wireless card or just Windows XP Home. Thank goodness, I have 29 more days to evaluate this software before I buy.