I experienced the same issue with my work laptop after I updated my Windows 7 via Windows Update recently.
My work laptop used to work fine wirelessly at home before this update. Then all of a sudden, it was unable to detect my home unifi wireless but all my neighbours' networks appear in the list.

Here's the solution:

1) Use a LAN cable to connect your computer to your router or use a friend's PC who could access your wireless network.
2) Log in to your D-Link control panel via 192.168.0.1 in your browser. Enter username as "admin", password leave blank. Click on Login button.
3) Go to Wireless Setup on your left hand panel.
4) Go to Manual Wireless Connection Options section, click on the Manual Wireless Connection Setup button.
5) Go to Wireless Network Global Settings, un-check the Enable Auto Channel Selection option.
6) Change the Wireless Channel to 11.
7) Save the settings. Restart your computer, and then magically, you could reuse your wireless unifi connection again!

my pc is vista which i cannot connect to the unifi. I have changed the setting for the wireless according to the TM instruction but it still not working. Can any one help me on this?