Registering dll's

Hi all, bear with me I am a dummy, so please feel free to treat me like one.

I have a succesfull install of Win 8 on a HP proliant micro server that I am using as a desktop. I have managed to load all of my programs with the exception of one. The program is basically a database for the insurance industry.

My issue is that I keep getting a message saying that a particular dll is not registered. I have tried

Log on as admin
Found the user account control settings and put the slider at it's lowest setting

Used the EMSA register dll tool to try and activate the dll. This reports that the dll is registered, but when I try to open the program I get the same message that the dll is not registered.

Any help would be most appreciated.

thanks

Nobody