I'd start downloading the one at SNESOrama.
In the meantime, you could try ISOBuster, CDRWin or CloneCD to rip a new image from the one you've got, but if Alcohol can't do it...
I'm sorry I can't be more helpful, but I still don't have everything I need transferred to and installed on my new comp yet, like any of my CD ripping software or game's lists, so I don't even know if I have a copy of Street Fighter Zero 3 that I can upload for you.
