Also try moving the INI files from ...\My Documents\My Games folder to any other location and see if that fixes the problem. If not then the problem is directly related to an ESP/ESM or any mod that creates or modify the ...\Fallout 3\Data\Menus folder, you can delete this folder if you're not using nor interested in mods that change interface settings like compass position/waypoints, shown messages, HP bar, HUD scale, etc or delete it and reinstall those interface mods that you know that worked fine before.