When you, or anyone reading, find yourself in a situation where you have so many things going wrong with your computer and you don't even know where to begin, the most logical thing to do is to show the computer to a professional. If nothing else, that person will safely backup your data and reinstall your computer.
The less logical thing to do, in my opinion, is to try everything you or somebody else can think of in the hope that something will work and not cause other problems.