Did you call tech support, it's toll free: 800-517-3001 I have it on 2 XP machines, no problems, a LOT of people have it on SI, no problems reported. You need Microsoft .NET Framework I think version 3.5 on your machine, but Jing will recognize if you don't and install it for you. I would call tech support, the wait times are very short for Jing support.