[CRASHES] Memory Management

So, it just started doing this today. I log into league, and attempt to join a game. Game loads, and we spawn on the Rift, but everything is really buggy. Champions stuttering back and forth, textures not loading, etc. About 25 seconds in, my game crashes, and the client shows me the "The Game Has Crashed" window. I hit "Reconnect," and it attempts. About 45% of the way in, it says I'm missing critical game files "Caitlyn," kicks me out again, and gives me the BugSplat dialog, and closes the client entirely. I relaunch the Patcher client, and it tells me I'm missing files. I attempt to redownload them again, and get a completely new BSOD, titled MEMORY MANAGEMENT (Error code 0xc0000006 [After further looking that appears to be an issue with my own computer...]). Big final question is: Why is "Caitlyn" missing?