I installed a free copy of Vista I got from Dell about 2 weeks ago as well, and immediately uninstalled it. I had made an image of my hard drive pre-upgrade with Norton Ghost so it was pretty easy to do so. I was actually pretty excited about Vista, and ended up being disappointed. My primary complaints include (there may have been more but I uninstalled too quickly to find them):

- they eliminated the expanding "All Programs" menu from the Start menu (wtf?), so instead you have to scroll up and down interminably on a little window in the Start menu. Think of it like using Start on your Blackberry. It's either that or use search to find your program.
- 10,000 shades of teal mixed with an unchangeable grey/black/silver Taskbar / Start menu = extreme nausea, plus there is no way to change it.
- Flip 3D is not useful because you have to use either a 3-key combo to use it or click on a little button on the taskbar to use it. I would have preferred just using my mouse scrollwheel...
- The "User Access Control" thing warned me 3 times in a row about WinRAR and I couldn't just approve the program...
- The start button is a lot harder to click on now since it's not synonymous with the corner - you have to visually find it.

I really liked IE until they screwed everything up in IE7, and now I've started using Firefox. I am wondering whether Vista will do the same thing and force me to start using a Mac and/or Linux. Linux still isn't an option though because the media copyright issues make it hard to use for multimedia applications. And a Mac screams "vendor lock-in". So maybe I'll just use XP forever...