Including 98, 98SE, XP, ME, MCE, Vista and all the rest.
Linux types, in particular.
Anti-Virus and whatever.
Shooters, strategy, adventure, and all kinds. Comparison of the PC as a gaming platform versus game consoles, including PS2, Xbox, Gamecube, PS3, Xbox 360, Wii and any others.
If it doesn't fit in one of the other software forums, then this must be the place for it.