In an older version of the game there was indeed a problem with the after-game battlefields turning your hero invisible. Installing the latest patch should fix this though.
You said the game crashes after you install the patch... On what does it crash? Loading a savegame where you are in the after-game battlefields? Using the "enter battlefields" option in the menu?
The patch actually don't install propely maybe it is the fault of my PC ... but I don't think so ...
I'm happy that I borowed the game from my friend and didn't buy it <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />