My WPS-HD network is marked with an shield and an exclamation mark.

If your WPS-HD network is marked as the screenshot below in Windows 7, it means your WPS network is not password protected. You should always set a password to your network if you have set the WPS to connect to your existing Wi-Fi network and have been sharing files in the network. To add a password to the WPS-HD network, please log in to the WPS-HD control panel using your browser, and find "Wireless Setup" section under "Network Setup". In "Wireless Setup" you can select your encryption method and enter the password desired in the "key" field.