Battlfield problem (Message: Data differs from server)

[koopatrooper]

I installed the game, then installed Road to Rome and finally cracked the game by replacing the .exe and .dll-files with the ones that can be found on this site. When I try to connect to a server it says "Data differs from server" and I bacome dissconnected. Trying to connect to another server directly after that results in a "crash" in the program and I end up on my desktop.

Does anyone have the same problem or even better know how to solve it?