Basically there is no windows 7 driver to make the bugger work with windows 7.
There are drivers for windows xp and vista etc but nobody has written one for windows 7. I was hoping the vista one might work?
So you have to buy one that is compatible.
PC world don't seem to have one but check ebuyer etc.
Try that vista link above and download the vista driver to see if it works. It has been posted on Netgear forums but no true fix.
Not just netgear but alot of usb wireless adapters won't work which sucks.
http://www.sevenforums.com/attachments/drivers/38026d1258803385-new-netgear-wg111t-driver-32-64-wg111tdriver.zip