Hello,
As I Am Very Experienced With Dell Mini's And Had Them All My Life The Simple Solution To This Is To Plug Into The Thernet Cable And A Download A Piece Of Software Called Driver Fetch. Then When It Is Downloaded Leave The Ethernet In And Click On Driver Fetch And Click Scan All Drivers Then Go Down The List Until You See Networking Tab Then See What It Says Under It That Is Ure Wireless Driver So Copy It Into Google And It Should Find The Correct Driver Download For You.
Yours Faithfully,
Dell Mini 10 Expert
Ben Lomas