Linux Problem in Network Manager - WiFi card disabled

hotshot05

Level G
I am using Linux Mint 9 Gnome : Isadora

I was trying to configure my wireless card to connect my PPPoE connection by using the command pppoeconf wlan0 and also pppoeconf
I was not able to dial my PPPoE connection when connected via Wi-Fi.
When I restarted my system, in the Network Manager, under Wireless Networks it says "Device not managed". Now I am not able to use my Wi-Fi card at all and cant connect to my Wi-Fi modem.

Can anyone suggest how to repair my system so that I can use my Wireless card again
Note 1: I have used the key combination Fn+F2 (which enables or disables the Wi-Fi card) many a times, but the same thing is displayed in the network manager.

Note 2: My ethernet connection is working fine. I can connect to the internet if I connect my modem using Ethernet port.
 
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