Registering and unregistering .DLL files

Open Command prompt and type: 

1. Register file:

regsvr32 <filename>.dll

or

regsvr32 <path>\<filename>.dll

where <path> is the path to the file, and <filename> is the name of the file.

2. Unregister file:

regsvr32 -u <filename>.dll

or

regsvr32 -u <path>\<filename>.dll

where <path> is the path to the file, and <filename> is the name of the file.