Windows is definitely hit and miss when it comes to stability, quality, and function. While I loved XP, I thought Vista was a broken mess. Windows 7, on the other hand, is fast, functional, and good looking too. It has pluses and minuses, but is definitely a win for Microsoft.
That said, it's not perfect out of the box so read on to learn what tools and tricks you can use to make it work better or, in some cases, work the way it should have in the first place.