i can confirm, VERY happily, that this adpater and the drivers from the gigabyte site work PERFECTLY in x64!
i can't tell you how happy I am right now! after MONTHS, finally we
have wireless on x64 without all the ridiculous ralink driver hacks.
install the utility, plug it in, enter your PSK and that's it... ONLINE!
super thanks for letting us know about this adapter m8!