can't connect computer to wifi router

 hi ….I an trying to connect an older computer (2002 windows XP) to my router Centurylink**** security type WPA_AES  …I have a netgear wifi usb adapter model WNDA3100v3….  it keeps coming up "wireless network connection, not connected firewalled"  there are 2 "X"s…. over connections but CenturyLink looks fine…..any help?  Thank you….PS  my first computer and laptop work fine…this is 3rd computer. 

Not connected firewalled suggests the firewall in the notebook is blocking access so I suggest you check there first.