RegShot is not an application used to delete the registry keys. I have installed it and the software is capable of comparing 2 registry snapshots to display the difference between them and their keys. This is good to analyze the keys stored in the registry. If you want a registry cleaning application, then I recommend downloading CCLeaner which features a cleaning option for obsolete registry items, etc.
Download CCleaner: http://ccleaner.software.informer.com/
After the software has been downloaded, install it and then click the Registry button and Scan for Issues. Once the process is finished, click Fix Selected Issues and the mentioned keys will be deleted.