i am having this exact same problem. it started yesterday. i had LW running overnight in the mornihg it had stopped with an error. i restarted and it worked fine untill i noticed that my computer was running slow. it was LW using 100% of my cpu. i have already tried reinstall an looking for viruses an spyware and every thing else that has been suggested. ive noticed that it slowly starts using more and more cpu, and that if i shutdown all searches in LW it gets better and then starts using more and more cpu again untill after several hours it will error and ill have to cntr alt delete and shut it down. i only inatalled LW two weeks ago. it ran peachy untill yesterday.