Summary: Windows 7 recognised the card straight away with the drivers but I installed them anyway, which gave me a faster and more reliable connection. WARNING FOR HACKINTOSH BUILDERS: bought this to work with OS X after TP-Link cards were recommend but it isn't picked up under Mavericks, will try Mountain Lion and report back.
Summary: Despite the hefty-looking aerials at the back of this, the signal strength just wasn't sufficient for me. Admittedly, my router wifi is weak, and the PC I fitted the card to is awkwardly positioned. But even with lots of aerial tweaking I ended up with drop outs, unless I pulled the PC out of the dark corner it's in. I'm getting better results with a USB stick pointing from the front of the PC. So, if it's a signal boost you want, this may not be for you.
Summary: I don't quite know why others have had any problems with this network card. I've purchased two now, one for me and one for my brother. They both work flawlessly - both on Windows 7 64-bit. In fact, they installed using standard Microsoft drivers. Didn't even need to use the CD that came with it.