Failed to load mpl_patch.all

Hi there.

I am from Sweden and i purchased my copy online... OFC i get my hands on a polish version!!

I managed to fix this language problem with a FIX file.. It worked fine for like 1.5 month, but then...

I double klick on Black ops multiplayer and the game tryes to start. But it cant start becouse i get this problem:

Error during initialization:

ERROR: sound bank failed to load mpl_patch.all. You have a build problem.

I have tryed to validate the lokal files inside steam and it workes... But now my BO2 is in polish again!

I reinstall the language fix and the game crashes again!!!!

PS

I can play singelplayer mode..

PC version

Plz Help!

Best regards

Christer Svensson