Set Encode (8B2A)

Hi,
I am a linux Newbie, i installed RHEL5 and was trying to activate my ethernet card.When i selected the relevant driver from the list, I am getting an error "set Encode" (8B2A) Error for wireless request.
I dont think my network adapter is a wireless network adapter how to overcome this problem.
I really appreciate the help.

Thanks,
Aravind.

Please post the steps you used to do this. Are you using the GUI or the CLI tools? Also, what card/controller is it using? What is the output of:

lspci -v