Please bear with me as I'm a complete Linux Newbie.  
I'm running Ubuntu, with a dell 1450 usb wireless adapter. 
I installed ndiswrapper v.1.18. I followed the direction to a tee and all looks good. 
When I do a iwconfig here's what I get 
eth2 IEEE 802.11b ESSID:""  
Mode:Auto Channel=1 Access Point: Invalid  
Link Quality:0 Signal level:0 Noise level:0 
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 
Tx excessive retries:0 Invalid misc:0 Missed beacon:0 
I type the "sudo iwconfig eth2 essid home123" and I still get the same output as above and don't get any errors. 
if I do a "sudo ndiswrapper -l" 
I get this: 
"Installed drivers: 
dellnic driver installed, hardware present" 
when I do a " iwlist eth2 scan" 
I get this: 
"eth2 No scan results" 
So, what am I doing wrong?  My ap is web enabled, and I typed in my key per the instructions, but that didn't help.
let me know if you need more information.