Login at your Kimsufi Control Panel, change netboot to Rescue mode and reboot your server. You will get an email from OVH with the SSH details to login to the Rescue System.
Choose one of the Windows Templates above. You can choose between Windows Server 2008 R2 (Standard, Enterprise, Datacenter & Web Server, Windows Server 2012 R2, Windows 7, Windows 8.1 & Windows 10.
Follow the instructions in the pop-up that shows up when you select a windows version. Go get a cup of coffee in the meanwhile because the Download & Install will take around 30 minutes.