1)Please post a picture of your device manager.
To do so click
in the search box type in "Device manager", click on it once it pops up in the search list.
Please post a picture of it.
2)You may also want to try Windows Update, both recommended updates and optional updates, many times they have the drivers required for a lot of hardware.
3)If that does not work try this Drivers and Downloads | Dell [United States]
Download and install it.
Any errors please report back before continuing. Also please follow my advice in the order from 1 to 3
Or if your not comfortable and require more guidance on any of the steps please let me know.
Do not proceed unless you are comfortable and experienced.