I am trying to decide whether to purchase Fusion 4 or Parallels 7. I only need Windows 7 for two programs that require Internet Explorer and some windows USB drivers. I find that both Fusion and Parallels are pretty much stable for my use and I prefer the UI that Parallels provides and I like the fact that you get the Windows start menu with Parallels. Btw, I am running Windows 7 64-bit with 4GB & 1 core for the software and 4GB & 1 core for Lion. I am not playing any games. What do you think? Thanks for any help. Btw, I had my trackpad freeze on my 2010 2.4 MBP 13. This happened once, when I was starting Windows 7 under Fusion. I also had a corrupted Boot Camp partition. This happened once under both Fusion and Parallels. This last problem was probably because I shut down the programs quickly, without going through with the whole Windows shut down procedure. Thanks again.