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a problem enabling wifi on netbook running ubuntu 10.4

I used to have no problems with the wifi on my Acer One netbook. After a friend played with the network configurations, the wifi is disabled.
I have no idea what he did (and neither does he...)
I gathered some info, and hope you can help.

Code:

ariel@segal:~$ sudo -i

[sudo] password for ariel: 

root@segal:~# iwconfig

lo        no wireless extensions.



eth0      no wireless extensions.



wlan0    IEEE 802.11bg  ESSID:off/any  

          Mode:Managed  Access Point: Not-Associated  Tx-Power=0 dBm  

          Retry  long limit:7  RTS thr:off  Fragment thr:off

          Encryption key:off

          Power Management:off

          

root@segal:~# 

root@segal:~# ifconfig wlan0

wlan0    Link encap:Ethernet  HWaddr 00:23:4e:34:bf:bd  

          BROADCAST MULTICAST  MTU:1500  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)



root@segal:~#

try connecitng with nm-applet?

type nm-applet& in cosole

I tried it, but got a message that nm-applet is already running. I killed (-9) nm-applet and typed nm-applet& from the console and got in return:
DEBUG: old state indicates that this was not a disconnect 0