I'm mainly a PC user, however, my PC took a crap so I fall back on my xbox. It's sad when my xbox has been more dependable than a PC. I'd normally say otherwise, but my PC has broken down too many times while my xbox has never had a problem and I've owned it longer than the current pc I have had.
PS3, I would love if they just got their heads out of their asses and allowed backward compatibility instead of groping for profits because they have free internet and online content. It's a little ridiculous because I have the physical copies of games I love and work as if they were new but that's not good enough, I have to buy them again over market to play them. This is the only reason I would prefer to buy a PS2 rather than that console.
WII is simply not my type of thing. I don't feel like spending that much money to play a virtual bowling game, the only game I really find amusing.
Oh, and OP, Windows is the same as microsoft, as is xbox is the same as microsoft. Might want to remove microsoft from the list.