Microsoft started pushing Windows 10 Creators Update & one of the major bugs prevents taskbar volume control responding to mouse clicks. Ie, the user cannot control the volume using the taskbar icon.
After many attempts to re-install the drivers using Windows device manager, I had to download the Windows 8.x drivers from Dell support & the manual installation helped.
So if you are too eager to checkout the Creators Update, please be sure that many of the broken drivers could not be updated using the device manager, however using manufacturer provided driver packages. You can download the drivers for Windows 8.x & unzip the packages using 7-Zip and point to the extracted location incase if the package says it cannot install by normal terms.
Hope this helps few out there!