When you disable the Broadcast SSID on your(AP) or wireless router, you will no longer be able to view the SSID in Site Survey. The only way to reconnect is to manually configure the wireless card.
Step 1: Log into the configuration by double-clicking on the bar graph icon in the system tray. You can also access the configuration by double-clicking on the blue D-Link icon on the desktop.
Step 2: Select the Configuration link from the left hand menu. Enter in the SSID of the AP, change the mode to Infrastructure, and click Apply.
Step 3: You can view your link quality and signal strength from the Link Info page.