Reddit mentions of Guitar Hero III: Legends Of Rock - PC

http://www.amazon.com/gp/offer-listing/B000YQ7B5W/ref=sr_1_1_twi_dvd_1_olp?ie=UTF8&qid=1454006037&sr=8-1&keywords=guitar+hero+iii+pc

Guitar hero 3 released on pc back in the day. I played a bunch of it on there.

Edit: https://www.amazon.com/Guitar-Hero-III-Legends-Rock-Windows/dp/B000YQ7B5W

Some of the Guitar Hero games (3, World Tour, Aerosmith) have Windows and OS X ports. No idea how well they work, but they exist: http://www.amazon.com/Guitar-Hero-III-Legends-Rock-Windows/dp/B000YQ7B5W/ref=pd_sim_sbs_vg_1?ie=UTF8&refRID=12XAKY8Y4473NWZQH94H

Other than that, Fofix is probably your best bet, but it can be pretty buggy at times. If you were using vanilla Frets on Fire before, this fork is much better. http://code.google.com/p/fofix/

http://www.amazon.com/gp/aw/d/B000YQ7B5W?vs=1

This should be it.

http://www.amazon.com/gp/aw/d/B000YQ7B5W/ref=pd_aw_sims_3?pi=SY115&simLd=1

Its cheap, and if you haven't gotten Amazon Prime, sign up for 30days free, and get it with free 2 day shipping!

No... But you could buy Guitar Hero for the PC.
http://www.amazon.com/Guitar-Hero-III-Windows-DVD-PC/dp/B000YQ7B5W/ref=sr_1_4?ie=UTF8&s=videogames&qid=1266133916&sr=8-4