$ sudo ndiswrapper -l
netr28ux : driver installed
If it doesn't also report 'device present' that strongly suggests that the netr28ux.inf file doesn't cover your device:
ID 0846:9012 NetGear, Inc. WNDA4100 802.11abgn 3x3:3 [Ralink RT3573]
Where did you get the file? Is it for Windows XP? Are there any clues here?
dmesg | grep ndis