Did you read through the link I put in my post above?
Do you have a Blue Tooth Icon in the notification area down near the clock in your task bar?
You need to make sure that your have installed the latest driver from Dell to support your Blue Tooth radio, you should check here Link Removed
It would seem that you have a couple options for your particular computer, if I've located the correct one.
I suspect it is likely the 1703 driver but it may be the 1704. You may have some documentation that came with your computer that may tell you which one it is.
Once the proper driver is installed and you've turned on Blue Tooth on your phone (it is not always or even often on by default as it impacts your battery) then it should be a...