The gpu issues affect the 15" only. The 13" doesn't have the 330m. Marvin is correct regarding the kernel extensions. It would have to be a significant filesystem error to introduce that kind of problem. I guess it could happen. If that was the case I would still wonder about the origination of that error. If you're trying to track down an error in the OS installation, a clean install would be ideal. I would then retrieve other file from backup.