I read all the guides and loaned my mates edimax wifi adapter then spent severals evenings getting no where.
the guide links to another guide for the edimax.
then I ordered a Ralink R5370 Chipset one.
this actual one
http://www.ebay.co.uk/itm/150Mbps-Nano- ... 1c479203a6
and it works great
just thought I will tell people as I found it confusing locating a good one.