64-bit device drivers have been a Windows Logo Program requirement since it was revised for Vista.

 

I've been using this Encore adapter since Windows 7 was in Beta or RC:

http://www.newegg.com/Product/Product.aspx?Item=N82E16833180053&cm_re=802.11n_usb-_-33-180-053-_-Product

 

It was around $17+shipping when I got it. It doesn't appear to be available for less than $40 now.

I use the chipset manufacturer's drivers (Ralink RT2870) - driver-only install, and have never had a problem on Windows 7 x64.

http://www.ralinktech.com/support.php?s=1

 

This AZIO adapter also uses a Ralink chipset and is currently $20.

http://www.newegg.com/Product/Product.aspx?Item=N82E16833340014&cm_re=802.11n_usb-_-33-340-014-_-Product

 

@Beatbuster - The wg111v1 uses an Intersil PrismGT chipset. I could not find a Windows x64 driver for this chipset. The one on Netgear's site is 32-bit. The other versions of the wg111 use Realtek chipsets, (RTL8187L for v2, RTL8187B for v3) so their drivers won't work with your v1.