norton internet security 2008 does the same thing except when i'm on-line playing a game and the game can't respond or i can't respond to the game!
i came here for the very reason you stated to see if it does happen; now that i have my quad core system i not need to worry as i haven't noticed!
can you compare norton to live care and which would you suggest as i'm still ticked at norton for non-helpfulness on this problem with old computer!