I'm having the exact same problem, here's my theory:
You are using windows 98 SE, that is when you get the 120 error.
I have yet to get anything to work on my home PC's, I have XP professional on one, and Win98 SE. I load up the XP PC and it "works" just crashes/locks up, on the Char select screen, Boot up on the win98SE and still get the 120 error... haven't figured it out yet... but still learning. At work I'm running Win2000 and don't have a single problem.
Possibility that XP is having a conflict with my Gigabyte 128mb 9000 pro?
don't know... not sure if it's related to Direct X 9.0 or something else... if worse comes to worse, format and reload, and I'll try again /shrug
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