Installed 18912 on my three test computers. Norton was rendered totally useless and crashed on all three. Ran remove and reinstall from Norton without any luck. Removed Norton and tried to re-install clean with no luck. Then went into Regedit and removed all vestiges of Norton and re-started from the Norton web page and it still crashed. On all three computers.
Yes, I dropped a note on the Norton site. This is just an FYI for the folks here. Yes, I know that this is "beta" software and I should expect things like this. And I really do from MS lately. (sigh) I am just trying to head of the Flamers prior to them really getting started.