Summary: I'll admit it - I have a picky system, running ye olde XP and for whatever reason, USB wifi adapters just don't play well with my setup. I've tried all the major brands and all of them lose network (connection, drivers gone, no power to the USB dongle) after anywhere from 30 seconds to 30 minutes.
Be careful of old versions of D-link DWA-160 adapter
24 July 2011
Summary: I have just a friendly warning to all potential buyers of D-Link DWA-160 adapter. Not all D-Link DWA-160 adapters work with Win7: Only the latest ones with F/W firmware version 1.60 or 1.80 may work (see D-Link hereby). I have heard you also need H/W Hardware version B (not A) as well.