When you clicked delete it actually deleted your quicklaunch folder. If you want it back you just need to make a new folder named "Quick Launch" in the appropriate folder. Not sure about other versions of Windows but if you're using XP it's at "c:\documents and settings\user_name\Application Data\Microsoft\Internet Explorer" where user_name is your login name. You'll have to add all your links back in the folder but that's a pretty easy thing to do.

It's been a while since I've used explorer but if I recall, you should be able to right click your taskbar and uncheck the Quick Launch option or drag it down to zero width.

If you just want to remove the Quick Launch line from your pop up, all you have to do is comment it out of your popup.rc file in your litestep personal folder by adding a semi-colon in front of it, saving and then recycling.

Hope that helps.