Reinstall Windows without USB or DVD

This is kind of task that you do not do everyday, but at the same time it should be easy to find how to do it if needed, but it is not.
You need EasyBCD app, ISO image of Windows and license key to do it.

1. Go to Computer management -> Storage -> Disk management
2. Shrink some existing disk to create a new one
3. Copy ISO content to the new disk
4. Restart PC to boot from WinPE
5. Install Win
6. Extend existing partition to remove ISO partition and return space