I am uninstalling Norton Internet Security 2009, it took 12+ hours to NOT finish a full scan.
The scan locked up my PC for 30 minutes while scanning a DVD-0ROM (5 CoD WoW). Only patience and strl+alt+delling and keyboard shortcuts revived my pc as the mnouse and screen was not updating period.
I expected better than this, maybe you need to focus less on resource usage and actually use the resources to get the job done rigth and faster.
Uninstalled.