I am a Mac user, but would really like to be able to play Street Fighter on my PC. I believe that using Boot Camp, I would be able to install Windows OS on my computer, but that seems like a really expensive option considering I will probably only use it for playing video games. Is there a cheaper way to make SSF4 compatible with my computer?
Nope, not with anything resembling decent performance.
Boot Camp’s your best bet. You can get the Windows 8 release candidate as a stop-gap, just to test things out, entirely legally right here; that’ll expire a short time after the full release is out, though. I think Microsoft has a pretty reasonably-priced plan for the Win8 release, but I don’t know what a full or OEM version of the Home version is gonna run you.