Re: Quick Launch: Internet explorer opens twice.
I don't know why it's doing that, but..
See what happens when you right-click-drag IE on the desktop and create another shortcut. Does it still open two programs? If it doesn't, will it successfully move to the quicklaunch?
Are the other quicklaunch icons working fine?
What happens if you modify a working quicklaunch icon (if you have one) to point to IE instead? Or make one from scratch by right-clicking the desktop?
If it's only affecting IE, perhaps a reinstall would help?