In plain English, this means that your computer is trying to run an application (the game), but the application is requesting specific files (DLLs) to function. When Windows goes to fetch these files, it finds a mismatch. The file might be the wrong version, it might be corrupted, or—most commonly—it is a 32-bit file trying to be read as a 64-bit file, or vice versa.
Sometimes Windows misidentifies the game's permissions. assassin 39-s creed 0xc00007b error