ok so i have a Macbook Pro running Tiger. My friend recently gave me a copy of Parallels which I installed today. The installation was going fine and it seemed like it was 99% done until it said "Product Key Invalid." Now the product key was for Windows XP from my old Dell. Someone on another site said that Dell Win XP product keys only work on Dells...Is this true??? and if so is there someway I can solve all this without buying a new version of XP??? Im very low on cash at the moment and the last thing I would want to do is buy a another copy of XP when I already have one that works fine.