Some new license error. PrDSS on Win 8.1. I know that the OS is not supported by Autodesk but my customer made a mistake.
Error -158 indicates a problem with Trusted Storage. Autodesk licensing does not use this feature, so it is odd that you would ever get it. If this is a network licensed version, it should work with Windows 8.1.
Have you installed the latest service pack?