I, too, have a G3 Mac, and I'm afraid some of the other responders don't realize that the old technology of a G3 won't support the latest versions of the Mac's OS X. The best you can hope for is running version 10.1. For anything later, you're out of luck.
If your Mac's down, you can't run anything, neither the v9 emulator or the new "Bootcamp" which only runs on the new Intel processors.
You must be running something, though, because you're still on the internet and posting away.
Good luck.