Vanguard killed my PC

Hello everyone, I ran into a "small" problem and was hoping someone here has an Idea on how to go about it. First of all some context. I never had trouble with playing league or any other riot games, until yesterday. My pc bluescreened 3 times in the same match. So I went online to look for some possible fixes. One suggested idea was that Vanguard could be responsible for the BSoD. So i wanted to unistall, and then reinstall Vanguard to make sure everything was in order. Now here my problems start. Instead of uninstalling Vanguard, my PC got another BSoD. Just that this time my PC won't boot anymore, because of some system critical failure. Either I get the bluescreen that the PC wasn't properly started and needa to be rebooted, or I get the screen that there is a critical system failure and the PC will be shit down. Luckily I do have a backup fromna couple weeks back, but I can't even boot the PC to get everything up an running again. I guess that's it for the rant. Now to look for some way to boot up windows anew.

Thanks Riot