No that's not it...   It is listed under other devices as a "Network Controller "  All my devices are working except for the wireless broadband adapter...

Hello,

The Driver R312280.exe is a driver file for wireless and Bluetooth card.

When you say Network Controller Driver for the Vostro 3550, are you referring to the Ethernet Controllers?
If yes, please click the link mentioned below to download and install the drivers for Ethernet Controllers.
http://www.dell.com/support/drivers/us/en/19/DriverDetails/DriverFileFormats/Product/vostro-3550?DriverId=T3WGR&FileId=2731100256&urlProductCode=False

Please reply for further queries would be glad to help.

Any other ideas Allan ?

 I’d request you to private message me the system service tag number. To private message, accept my friend request; click on my user name and click start conversation. 
I’d be glad to assist you further and let you know the next course of action.

You can download the Intell driver here and it should work:

http://downloadcenter.intel.com/Detail_Desc.aspx?ProductID=3314&DwnldID=22116&lang=eng&iid=dc_rss