World of Warcraft won't open - rundll32 high cpu usage

Very recently WoW stopped opening for me. I click the icon, my CPU usage goes to 100% but the game never loads. When I check task manager it says rundll32 is what's causing the high cpu usage. Recently I installed "360 Total Security" with has a Game Booster mode. I tried to exit the AV but still had the same problem. After I uninstalled 360 Total Security and rebooted World of Warcraft opens fine again.