Need wireless drivers for sony vaio pcg-71911l -

DELL LATITUDE E5420 WARRINTY TILL 05/04/13
DELL LATITUDE E5420 3GB RAM i3-2350M 2.2GHz 250GB HARD DRIVE MINT CONDITION 14.1 SCREEN 3GB 1333MHz Dual Channel DDR3 SDRAM Intel i3-2350M 2.2GHz processor 250GB HARD DRIVE Windows 7 Professional MINT CONDITION Includes original power supply / charger DELL collect and return warranty until 05/04/2013 COST NEW NEARLY £700 BARGAIN PRICE