Hahaha! You see what we have to go through in Bethesda games. So I guess you can buy the GOTY edition, if you're willing to go through the process Reflexmatrix explained. Another bach of great testers Bethesda used, right?
Well to be fair it was 4j's fault, and to be even fairer, this was literally -the only- major bug causing problems for the majority of GOTY Oblivion players. 4j did well with their port. Bethesda could have patched it themselves..but y'know, that would require some small ammount of effort. As for the process itself, it takes about five minuites and you get a laugh out of it, so it could be worse. The bug is only viewed so harshly as a problem because only a few people know this particular work around. I see it as one of those funny bugs we laugh over.