I tend to use my computer for listening to music most days. That and forums/MSN/other sites I check up on from time to time.
Other days I may use it to attempt to write some music, or to do some 3D modelling.
I don't tend to game much on my PC. If Stepmania/Lunatic Rave 2 is included though, which I'm guessing it is, then yes, I do game on it too