Amen to KingTomato's post. I have Windows, it runs fine for me. If it did not run good, I would go get a Macintosh or run Linux or something.
Better yet, if someone doesn't like Windows why don't they try making an OS themselves? The people who bitch the most have no real idea what kind of time and manpower goes into making Windows, and why its all needed. (I.. umm.. don't know exactly either as I do not work at Microsoft and I have never tried making an OS. But Jesus, just trying to code a friggin tiny application in C++ you can start to imagine how giant something like Windows is)