Data Error(CRC) on running Warcraft 3

I need some help with my warcraft 3 game.
Yesterday it was working good, but then today when I tried to open it this suddenly comes out.

war3
This application has encountered a critical error:
Data error (cyclic redundancy check).
Program: c:program fileswarcraft iiiwar3.exe
File: War3X.mpq
Press OK to terminate the application.
I tried to re-install the game and all that, but it still gives me that error thingy.
Someone please help me! I want to play already!
