Hi,

The wireless is not working because the wireless card drivers are not installed on the system. Since, you donot have an ethernet card, you can download the drivers on to a USB flash drive and later install it on your system.

Please use the link below to download the drivers:

http://dell.to/UTwbyB

Enter the system Service Tag,select the Operating System  and now select the Network option and download and save the specif WLAN drivers on to your USB flash drive. Once done install the driver on your system. Restart the system and check if the issue is resolved. 

Please reply.

Thanks and Regards
Priyanka S
#iworkfordell