xbox360 players make up a majority of there players.
The PC players are the OGs though. We're the ones that bought TES games when they were PC exclusive, and kept Bethesda going. We're also the ones that provide Bethesda with a crapload of ideas/innovation with mods. There's a number of features in Skyrim that can be directly attributed to an Oblivion mod. The PC players, are more or less, the more devoted fans of TES games. We're the ones that put 1,000+ hours into a TES game, when most of the console players stop playing at 100-250 hours. Mods have a big part to do with that, however.
The fact my computer is run off a Microsoft OS is lost on MS? Why the hell wouldn't PC and Xbox launch at the same time?
Don't forget, not all PCs run off of Windows. I have quite a few friends that use Macintosh, Linux and even Ubunto.