Turn On Wireless Capability Windows 7 64BIT

I have a desktop computer, and have a D-Link DWA-510 wireless network adapter installed. Though I cannot pick up any wireless networks even though I know there are wireless networks as my iPhone picks them up.

I have tried the following:

1/ Clicking on the wireless/internet icon (not sure what to called it, it's the icon that brings up network and sharing) located on the bottom right of the bottom task bar. though no networks show up.

2/ Adding a new wirless network via 'Network and Sharing' option - though when windows does a search for networks it never stops searching.

3/ Installing the new drivers from the D-Link website

If I look at the back of the tower the network card that I have the external antenna connected to has one static green light lit. So I gather it is installed correctly as it is lit and it was installed when I brought the computer, although if I go to device manager it is not listed under Networks?!. I have triedto search on turning the wireless capability on though I cannot find a solution that actualy turns it on.