My Computer Used to Run League...

It's sad to say that I am really depressed right now...

I can't play League anymore because my computer literally refuses to run the damn thing. I have tried everything I could, except for a virus scan. I have cleaned all of my registry errors, cleaned out the junk data in my hard drive, uninstalled and re-installed the game, changed the priority settings to normal, everything I can think of to try and run League and I can't. My computer will not be able to handle it, even though it used to run it beautifully on low settings, and now, I can't even play it anymore. I'm sad. I am really, really, really sad right now... I lost one of my favorite competitive games, simply because my computer decided it wants to be an asshole. I know I'm not even that great at League, but I want to practice it. I want to get involved with the League community, and so on, but my computer can't run it. I don't know what I did wrong, or even how I can get my computer to run League anymore, despite the fact that I can run Hearthstone, and some of my heavier games on my computer with little to no slowdown.

I am extremely upset right now, and it's going to be a long time before I get the money to buy a new PC to be able to run League and play it with the rest of you guys... So, if anyone has ANY suggestions on what I could do, please... Do me a favor and help me in ANY way you can. It would make my day so much better. Thank you in advance for your kindness.