To be able to remote desktop into a Windows computer, first make sure that the version of Windows OS you are using, allows remote desktop connections. Click start and type "allow remote access to your computer", if your Windows 7/8/10 machine shows a setting, click on it and make sure that the settings look as following:
(Full size: https://i.imgur.com/FsIVVlF.png)
(Full size: https://i.imgur.com/yMN23ni.png)