I want to go ahead and purchase Windows XP Professional to run with Parallels for IE testing. Does anyone know a good place to safely purchase a copy? It is listed on Amazon, but if you read the recent comments posted, it seems as though some people are receiving pirated copies, or copies with serial numbers that do not work. Also, $300 for software that is 2 generations old seems kinda steep. I'm not looking for anything free, just want to get a better testing environment set up on my machine. Any suggestions?