Hooking up / using the R_45 jack ? XPS15 ( L502X)

Hello To All  !

Merry X-Mas To All, !

Question ,  Just Brought  A " XPS 15 " ( L502X )  .

Tried To use the "  R-45 " Jack on the back , Windows Say's  " Hardware Not Found ..... "

 Went  to my DELL to Check " my Hardware ConFig . "  It SAys Not Installed ,,,  "

I Sometimes get Into Areas With NO WYFI or A Bissness that still run CAT 5 Cable's  ,,,,,, SSSSOOOOOOO ?????????????  .................

What Do I Need ??????

Part #'s  ,,, Please ....

Where to Purchase ,,, Please .....

I Would Like to Install the Card Inside ( IF Needed / IF possible > No Doggles or Adapters for Ouyside , Please .... )  ........

A WYFI  '''' Half Card '''' Is installed Inside ,  The " half Card " is a   Intel Centrino Wireless - N  1030  ( both anttenas are hooked up ) .

 A full card slot is open / Empty .

Any Ideas ,

Thanks ,

Later,

M.K.

Atlanta , GA. USA