Black Screen of Horror after champ select (HELP!!!)

I have had the Windows Firewall error for only 3 days now. The one that loads a black screen after champ select. I have done at least 5 hours of research, and I have found at least 15 different ways to fix it. I've tried everyone. But not one has fixed mine. I am getting really angry, and I don't know if i'll ever be able to get this fixed. Please try and tell me absolutely every single possible way to fix this. I will appreciate anyone that trys to help me. THANKYOU