RegShot is an excellent registry tool that helps anyone to compare the changes that have been made to the Windows registry before and after some set of operations...
— I have downloaded RegShot, but there is no instruction on how to use it, so far I have not been able to delete anything. Can you help?
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. Read more