This error is usually encountered when there are problems with OCX and DLL files. Firstly, I would recommend cleaning the registry files with the help of an application. For this procedure, you can use Registry feature from CCLeaner. Download and install the application, then click Registry and analyze them. Perform a deep cleaning of the registry files and the repair the software and everything should be OK.
I would also check the tips on the official website for this application: http://allapi.mentalis.org/tips/alltips.shtml