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I'd have to go with my majority and say there are more guys than girls on PC. There's quite a few girls too, but most of the people I encounter are male.
That's a horrible stereotype.
Girls play RPGs more often than boys, in fact.
And some of us, myself included, like fighting games (one of my time killers is Soul Calibur 3; fun game!), FPS, etc.
And 90% of the games I play are RPGs.
Don't generalize. :[
Anyway, I think that it's probably closer to half boys and girls, with boys being slightly higher in number.