Well, I guess ACCESS VIOLATION could be either a permissions problem (or maybe you're trying to run if off the CD?) or an illegal memory location. If the latter, that's quite a common bug that really tells you nothing specific. First I would simply try to reinstall WoW. Since it's a new install, there are no settings to get messed up yet.
But I'm not sure why you're asking this on a Mac forum. You might get an answer but it doesn't seem like the best place to ask. I'd ask your question on one of the official WoW tech support forums. Do a search there too. With close to 10 million people playing WoW, It's quite likely someone else has already had this exact same problem.
EDIT: This thread has some info and links about the error.