Its possible that the dll didn't get registered properly during installation. Its important to be an administrator if you attempt to fix this in the following way. 

You can try this:

• Go to the Search window and type cmd, right click on Command Prompt and choose Run as an administrator option.

• Type the following command in the command window and hit Enter - regsvr32 <dllname>

Example:

So if I was to register ProSeries.dll I would type in the command prompt... regsvr32 ProSeries.dll