Find the DLL in the windows directory (or possibly the windows\system32 directory) and try copying it (not moving!) into the application directory.
You've not mentioned anything about your laptop, but likely application directories are
C:\Program Files\Activision\Call of Duty
C:\Program Files (x86)\Activision\Call of Duty
C:\Users\CURRENTUSER\AppData\Local\VirtualSto
re\Program
Files\Activision\Call of Duty
C:\Users\CURRENTUSER\AppData\Local\VirtualSto
re\Program
Files (x86)\Activision\Call of Duty