I got mine a little differently a month or so back. My four year old HP Pentium 4 had Me on it. For a variety of reasons I decided to upgrade to XP, and chose the new version with SP2 already included, though the old version was still available in stores. This seemed to be the best route.

About the worst thing that happened was that a message popped up saying that it didn't recognize my printer (HP 722C), though the printer continued to work before the work was done.

A few programs had to be reinstalled.   For example, both Sound Forge and Microsoft Works continued to work, while neither Roxio nor Nero would.