From: www.itworld.com

Norton 2009 Update is locking up Computers!

by Customers have been calling reporting locked PCs after recent update

October 12, 2008 —

 

Started getting phone calls about locked and frozen PCs after installing the newest update to Norton's 2009 Internet Security.

Symantec has nothing posted on it yet. So, I've posted a temporary workaround to get you into your computer if you're frozen.