Problem Installing Norton Products on Mac w/ OS X 10.6.8

I downloaded Norton Internet Security Mac Edition and it was working for sometime and after a while it was not working. I reloaded it and it fails to work. The only item that works is the LiveUpdate feature. All recent updates are current.

 

The message I get if I try to double click anythig in the Symantec folder will display the message below.

 

"Norton Anti-virus cannot be opened because of a problem - check with developer to make sure Norton AntiVirus works with this version of Mac OS X. You may need to reinstall the application. Be sure to install any available updates for the application and Mac OS X."

 

 

HELP PLEASE. Thanks