Error Message:

The key currently selected is volatile. Registry Editor cannot create a non-volatile subkey on a volatile key.

Explanation:

This key is created during system startup, and is deleted when the computer is turned off. (Other, non-volatile, keys are kept in a file between startups). Since this entire key is volatile, it cannot keep non-volatile information.

User Action:

You might want to add the subkey to a non-volatile key.