I spent most of yesterday trying to figure out why my Netbook suddenly stopped recognising its wifi card. It wasn't showing up in the Device Manger though Windows was saying it was enabled and working. I reinstalled drivers, did System Restore and a multitude of other things to get it back - but total failure.
I decided to forget it and buy a USB wifi dongle from eBay instead.
I switched on the Notebook this morning to find everything is working correctly now!
I'm pleased and angry :)