There are two options:|
1. You have not given him enough time to start windows, which is usually the most frequent, and you should give him a reasonable time to start for the first time.
2. That windows has not been installed correctly and that you need to reinstall it, once it is proven that it is not a matter of time, you will have to reinstall the system. In the downloads section you will find the ISO of windows to reinstall as well as tutorial of how to do it.
In case of any doubt, consult and we will help you.