When you run CAD Manager Control Utility shipped with 2013 products and you have some of the 2013 products installed you might get the following error.
"Your system registry keys are invalid. Please reinstall your Autodesk application and try again"
Please add the following registry keys to fix this issue.
Registry Key Hive (Please adapt the path marked in red with the specific language and product you have installed)
Editing windows registry instructions can be found here
"Important: This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows"