When I try to open Firefox, it immediately shuts down and says, Firefox has stopped working-windows is checking for a solution. When I look in to this is says that the DEP (Data Execution Prevention is not allowing it through. It provides information on how to fix the problem but this does not help. Firefox is not listed as an executable program, therefore it does not allow me block the DEP for it. I have tried removing the program and reloading it several times, and the it will load up temporarily and then start the same problem again.