Describe the Issue: When i try to log in i get stuck on the loading screen for a bit, then the game crashes saying: 

This application has encountered a critical error.
Data error (cyclic redundancy check).

Program: C:/Turtle/client_1165/WoW.exe
File: Data/patch-3.mpq

I was able to log in with that character an hour or so ago, but now it doesnt work.

How to reproduce: By pressing enter world

How is it supposed to work: I get into the game

Character the bug occurred on: Juntogawa