Discord locks PC in a restart loop and won't uninstall

My son downloaded Discord onto his PC a couple of days ago and it has effectively locked up his PC. When the PC runs in normal mode (Windows 10) it crashes after about 45 seconds. A blue screen appears and the message says "Your device ran into a problem and needs to restart'. The PC then restarts and the same crash occurs, in an infinite loop. At first I thought the crash and the Discord app might be unrelated but to be on the safe side I booted the PC in Safe Mode and uninstalled the Discord app. Upon restarting I found that Discord had appeared again despite being uninstalled. I have googled how to uninstall discord and tried everything - uninstalling, disabling the app from running on boot up, removing all traces of the app from the registry etc. I have even downloaded 3 third party uninstallers, including Revo Uninstaller, all with no success. Discord is always there when the PC restarts. I am currently reduced to using the PC in Safe Mode as normal mode always crashes. I actually have no idea what Discord is but it would seem to be aptly named - it has caused chaos, and appears to be tantamount to a virus. I am on the verge of taking the PC to a technician. If anyone can advise at this late stage, I would be profoundly grateful. Thank you.