Quest module causing system freeze-up

[pvs723]

I have 10 characters on one server and my level 100 priest cannot use the quest module. System locks up and have to log out and restart to get computer to respond again. Works fine with all other characters. tried emptying the addons folder and only have Carbonite and the quest module installed. Plays fine unitl I enable the quest module. Tried a clean installation of WoW also. Driving me crazy.....any sugestions would be great...