No, it is not possible to install Windows on our Game-Root servers. We cannot make any exceptions in this matter.
Our Game-Root servers have a very powerful CPU performance. This performance belongs exclusively to you. In order to provide you with the best performance for the price, we have decided to only allow Linux operating systems on these servers. Windows consumes valuable resources and we want to avoid that.
If you cannot do without Windows but need sufficient performance, you should consider setting up a Dedicated Server. Although they do not match the CPU performance of the Game-Root servers, they are sufficient for most games on Windows.