Didn't know street fighter 2 came out on PC.

[Kitsune Sniper]

I've heard bad things about SF1 and (original) SF2, but SSF2 and SSF2 Turbo's DOS ports are both pretty solid.

... yeah the SSF2 port I have isn't very good. There must've been several versions.

[Jorpho]

http://www.scary-crayon.com/games/sf2pc/ is a very nice rundown of SF2 PC and some of its variants.

[tom]

SF II also on Commodore Amiga, Atari ST, Spectrum and Commodore 64

[Jorpho]

The original Street Fighter was also on the ST. The developers re-used the engine for something called Human Killing Machine, immortalized in this beautiful, timeless Ashens review:
http://www.youtube.com/watch?v=5zUkK14bHDk

[Genjackson]

SF II also on Commodore Amiga, Atari ST, Spectrum and Commodore 64

That's pretty close to the boxart of the the one I found. I'm afraid it has no megaman games included though, which makes me very sad.