Comment 7 for bug 144867

Just did an apt-get install of ndiswrapper

sudo apt-get install ndisgtk ndiswrapper-common ndiswrapper-utils-1.9

Then added ndiswrapper to /etc/modules, because else ndiswrapper doenst get loaded during startup and then you have to sudo iwlist wlan0 scan every login.

ndiswrapper -v
utils version: 1.9
driver filename: /lib/modules/2.6.22-12-generic/ubuntu/misc/ndiswrapper/ndiswrapper.ko
version: 1.45
vermagic: 2.6.22-12-generic SMP mod_unload 586

Attachment are the windows config files for 32 and 64 bit
Just start up the ndisgtk and select the correct ini for your system.

Mathew your card should work with this windows driver.
(list of cards supported is in the end of the rt2500.inf file)