Hello iPaYaMi. This notification might have disappeared due to a number of reasons:
- A setting was adjusted.
- A virus.
- You installed a program that would disable this function.
- A driver conflict occurred.
This issue isn't a huge problem, by any means. If you really want this function back, the simplest method is to reinstall Windows. If you would like information on how to do this, please reference this Microsoft website.
Let me know if you have any other questions or concerns. I'm only here to help!
Mario