I like windows, and I liked Vista, though that is probably because I didn't have a sub-standard machine compared to what Vista should have been run on. I now have 7 and absolutely love that. I started off with some unix based system, jumped to win 95 (which was alright, didn't really care one way or another about it)), and then switch to one of thos iMac all in a moniter things and had that for awhile. After that I moved to XP and then for a very short while to a Mac OS X G5 and consider that one of the biggest wastes of money I have made in my entire life. Luckily, a donation a couple years later and a nice little tax wrietoff and I went back to my xP machine which had lower specs across the board and still ran programs like photoshop better.
I haven't tried linux yet, and have looked at getting ubuntu, but probably won't bother until I get a new computer whereupon I'll put it on my current one to see how well it works out with me. That is unless I use a linux system for a college course
I dislike macs, but I will admit they require less workt o keep them moving along then any windows machine I have had until my current one with 7 on it. They are great for grandparents who aren't computer savvy because of that reason, but I believe that the Mac OS's lack of anti-virus capabilites is going to rear its head within the next five years and Apple will have to rely on iPods to survive again until they get real protection on their system.
So, I am definitely sticking with Windows, and am interested in eventually seeing how Linux works out.