Sorry for the late answer, but I guess this could be helpful:
After the guys at the indie bundle allowed the customers to link their games to their Steam accounts, I linked my bundle, downloaded the steam version, tried the game and it ran like a charm. Maybe the humble bundle version and the steam version are different, maybe steam thrown a magic spell over the game so it could run in my computer, but no driver problems, no crashes, just a charming gaming experiencie.
And again, sorry for answering my old thread, but given I found "a solution" one year before... ^^u