Today, while I was typing in my password to log in, my computer restarted.
I figured it was unrelated to League of Legends, so I tried again. It crashed again.
On the third try, I typed in my password very quickly and I was able to log on with no crash.
After some serious League pwnage, I took a break before coming back.
I decided to wait at the log in screen to see if it was still crashing and, of course, it crashed.
But, this time, the crash apparently reset my BIOS to default settings. (This crash was the first time it actually gave a blue screen, as far as I remember.)
That disabled my sound (which I fixed).
I am highly confused, but I believe if I type in my password quickly, I can avoid this situation.