The Midas.dll error can occur when RockWorks20xx is launched. It is caused by the midas.dll file not being properly registered. To correct that follow the steps below.
Close RockWorks.
Open up a command prompt by selecting the windows button + R at the same time.
Type cmd into the Run window like the screenshot below which will bring up the command prompt window.
On the first line after C:\Users\Username type (or copy and paste) in: cd "c:\program files\rockware\rockworks20\" and hit Enter.
That should bring up a second command line starting with c:\Program Fil