I work for a distributor that sells a fair few ASUS wireless cards, and I can tell you for a fact this card will work out of the box with Windows 7 32/64 bit. Drivers are actually in Windows 7 so it's just a simple "plug and play", no CD needed.
ASUS WL-138g V2
http://www.asus.com.au/product.aspx?...q6A&templete=2
Should do the trick.