It would have helped to know what version of IE we were to get involved with.
IE I think is keeping my PC busy as it wont idle and the PC has slowed down and is chuntering away as if it workin on something.
Open task manager and see what process is running that is taking so much processor power. Run a search on them (it) and see what is said about it.
open task manager = cntrl + alt+ del
keys at same time.
I do not
recommend that you delete registry strings on hunches. Nor do I recomend that you edit registry strings unless you are good at what you are doing!
Have you tried to uninstall IE and then reinstall it?