Before trying anything drastic like wiping the hard drive or installing a new disk drive, I would start with simple things first. Since you have a dell you must have their Dell Support Assist app installed. Try running this app to see if it will fix your problem.
Like someone already said, go to an earlier restore point before the update. Some times updates to not install correctly. If you don't have an earlier restore point to go to try going is settings, Update and Security, view update history, uninstall updates. Then uninstall the latest update.
If those do not work, run command prompt as an administrator. type in the following:
sfc /scannow and press enter. It will scan your system files and replace any system files that are corrupt.
Go to the link below to read more about the scan:
Use the System File Checker tool to repair missing or corrupted system files - Microsoft Support.
The above is where I would start. Computer problems can be very frustrating. Good luck.