Norton gone AWOL on my MacbookPro!

I recently had to re-install my system software (Mac OSX 10.4.11), and Norton AV for Mac disappeared.  If I double-click on the app in the Apps folder, it flashes briefly in the dock but doesn't open.  I tried opening the Sym Quick Menu as suggested on another thread, but I get this error message  'You cannot open the application "Sym Quick Menu.app" because it may be damaged or incomplete".  I seem to have mislaid my installation disc.  Is there a way to reinstall the programme from the Norton website?

Thank you, Sunil.  That did the trick!

I recently had to re-install my system software (Mac OSX 10.4.11), and Norton AV for Mac disappeared.  If I double-click on the app in the Apps folder, it flashes briefly in the dock but doesn't open.  I tried opening the Sym Quick Menu as suggested on another thread, but I get this error message  'You cannot open the application "Sym Quick Menu.app" because it may be damaged or incomplete".  I seem to have mislaid my installation disc.  Is there a way to reinstall the programme from the Norton website?