No net connectivity after updating from windows 7 to 10 preview

​I just updated my INSPIRON 15 N5010 from windows 7 to 10 preview and after update when I connect to my WiFi it says limited network. Then, I contacted Microsoft they said to update the driver. So tell me which one should I update and remember I don't have my net connectivity and application which support windows 7 won't run in my system.​