Try going into IE properties, and on the Programs tab click to reset the default Home Page and Search Engines, then on the General tab, change the Home Page back to what you want it to be. If it goes back to lop.com after you reboot, then something must be lodged in your registry. Do you know which software you may have got this from, or where you may have downloaded one of their software applications? It may be worth trying their own removal tool, but be aware that it could be a trick to install yet more spyware, depending how unscrupulous they are.