binkw32.dll is a component for the BINK video codec and is used to play compressed movies within application such as games. This dynamic link library is used mainly in games which use the BINK video technology to render their graphics.
To fix the dll missing error, you can copy the binkw32.dll file from your game's System directory to your game's root directory.
Or try re-installing your game to fix the problem.
http://support.microsoft.com/kb/911203
http://www.bestpcsavior.com/fix-binkw32-dll-error-how-to-deal-with-binkw32-dll-error/
