What is a DLL file?
Dynamic-link library (also written without the hyphen), or DLL, is Microsoft's implementation of the shared library concept in the Microsoft Windows and OS/2 operating systems. These libraries usually have the file extension DLL, OCX (for libraries containing ActiveX controls), or DRV (for legacy system drivers). The file formats for DLLs are the same as for Windows EXE files — that is, Portable Executable (PE) for 32-bit and 64-bit Windows, and New Executable (NE) for 16-bit Windows. As with EXEs, DLLs can contain code, data, and resources, in any combination. These instructions can be used to unregister DLL files.
Click Start, Run and type "cmd"
Type “cd” to change the current directory, press space on your keyboard, enter full path of the DLL file and press enter. To display the contents of directory, type “dir” and press enter.
Type “regsvr32 /u [DLL_NAME]“ and press the “Enter” button.