Client won't open?

I've had this issue quite a bit, but usually i can just fix it by closing processes that are still running in the task manager. This time, however, I literally couldn't open the client after a restart (currently being forced to reinstall via Hextech repair tool). Is anyone else having this issue, or something similar? I would like to add that I could still open and play the PBE, just not the Live game. Relevant specs: i7-8700k@5GHz 16 gb ddr4 memory (I can edit in more if needed)
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