I agree with Stripe, see if you can update it in safe mode, if you can't, you will have to remove Norton. Problem, you can't remove it in safe mode. You have to use an utility called NoNav.
I have a similar problem, but with the Symantec Antivirus, and it creates a Kernel cache, or panick error (can't remember right now, but I know it is 0x00007)
It is caused with Symantec antivirus, and the intel HDD drives. Symantec recomends updating the HDD drivers, but in my case it didn't do anything. Very annoying since I already have 4 computers that don't really work with SAV, and all are the same model (see the trend?)
I did a quick check, and the SymEvent.sys seems to create lots of problems, dating back to 1999