MTW2:After unpack error at the game HELP

[Lord of Terror]

Hi there!!!

I have a serious problem:
I unpacked the files.
I deleted the two files.
I think I changed something from the unpacked files.
I started a new campaign with the Holy Roman Empire.
My first attack was with the Rebels.
I lost because of time.
Then, Poland attacked me.
When it was ready to view my message of the battle, it closed and a message "exploded" :
"Medieval 2 Total War has found an unexpected error and now it will close"
Or something like this

Help please!!!!! Someone!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!