Hi Carol D
If it appeared following a Norton update, it's almost certainly that which has caused the error -- the update has evidently not installed properly or doesn't 'like' that particular PC's configuration for some reason. It's by no means unusual for an application to work fine until you update it. As this is a Norton application my own recommendation is to uninstall it completely, a process which will require you to download the 'Norton Removal Tool' to fully remove it, since Norton products are infamous for leaving there traces all over your PC after an uninstall. This prevents you from installing an alternative antivirus package. The removal tool is here: http://service1.syma...005033108162039
Whether you then decide to re-install and re-update Norton AV in the hope that the error won't re-occur is up to you, but I don't advise it.
Norton AV is big drain on system memory and adds considerably to Windows' startup time, especially noticeable on systems with less than 1Gb RAM.
On top of which, it was recently tested against it's competitors and came out not far from the bottom in virus detection. There are better security solutions out there, my own recommendation (which came top in that same test) on both price and performance being 'BitDefender', here:http://www.bitdefender.com/
Edited by pip22, 16 November 2007 - 08:51 AM.