Well I had no issues either installing Windows XP under Parallels, or after getting it installed. Everything works pretty much as planned. This is installed on the Macbook 2.4ghz. . It's obviously better than emulation has ever been but, it still leaves a lot to be desired. It's no PC for sure. But, it's far better than eny emulation software I have ever seen or worked with. It's snappier and loads faster however, it's not real hard to slow your machine down. Such as copying, moving files or burning cd's or dvd's. I may be wrong but, I suspect when I go to a larger hard drive and 8 gig's of ram that will help it some. The purchase I nade even came with 1 year of Kaspersky Internet Suite. It's overall performance is more than useful but, if one is wanting and waiting for faster emulation Parallels Mac 5 probably is not for you.