[CRASH]League crashes PC?!

Greeting fellow Summoners Please take your time to read through my problem, I'd really appreciate it! :) I have a really,really, really(!!!) frustrating problem to deal with. As soon as I type in my username - password and hit enter/the log in button, I get redirected to the main screen of the client and my whole PC crashes. This started happening right after patch 5.14 was released. And no I am not using a mac, I have read up on those threads though. :) Right after I noticed it I fixed it through using this little trick : **Right click > properties > compatibility make it compatible with windows 7 and tick the box to run the program an an admin ** This worked! Untill a minor patch got launched.... The same problem but the solution didnt work. I fixed it how ever through unistalling the latest security update of w8. And it worked untill patch where Fiora became available again. Neither of the solutions I tried before work. I even updated to w8.1. BTW I have limited amount of data/month so updating was kinda lika playing with fire if you play as much as me. :) (I am thinking about updating to w10 but not sure if that'll fix it. 2.5GB updates it to much atm. ) After that I tried to repair it, 2 hours of waiting for nothing, an error occured and it stopped. The error keeps occuring, I tried it several times. It is still not working, I still need to get the last icon of bilgewater, and I still need that gangplank game... If you have ANYTHING that may help, please! Tell me about it. (Reinstalling or resetting my PC is NOT an option)

Specs of my PC below: MSI GE70 Operating systen : Windows 8.1 Proccessor: Intel(R)Core(TM) i7-4700MQ CPU @ 2.40GHz 2.40GHz RAM : 8GB System type: 64-bit Operating System, x64-based processor