It is possible to install Windows on some Chromebooks such as the HP Chromebook 11 G4, the procedure isn't the same as with standard laptops that have been designed directly for Windows.
As there are places on the web that go into the technical side of the installation and firmware requirements, we will only briefly go over links to other tutorials and modified drivers by coolstar.org will be also below.
Ultrabook to Chromebook Reddit community:
In particular read:
Interactive setup and driver download:
Good luck, this will void any warranties, will purge all data on the device and has a good chance at bricking the device. Proceed with caution.