These programs might use shared code files called dynamic link libraries, or DLL files, that have a .dll extension, but you generally don't run or access DLL files directly.

How to Fix Missing DLL Files. Most native applications in Windows 7 use dynamic link libraries to accomplish particular tasks. DLLs contain functions that programmers can integrate into their ...

If it does not work and the DLL file failed to register, then log on by using an administrator account, and then register the DLL file.