League refuses to open, still uses memory

I tried to open the PBE and it froze up my computer for about 2 minutes and then didn't open, but upon opening my task manager I could see that it was still using the memory for the patcher and client. Trying to open another instance of League and clicking yes to terminating the current one seemed to have solved the problem, but I do not know why is it locking up my computer. This has only happened once, about 10 minutes ago.
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