Mugen Application

Go To Start Menu, Search for Cmd and open it as administrator!
After That Follow The Steps Below:

1. Enter diskpart, then list disk after diskpart is loaded.

2. Enter select disk [number of the disk the partition is on].

3. Enter list partition, followed by select partition [partition number].

4. Type active.

There you go! You can now close the command prompt and reboot your computer.