I have been having all sorts of problems with my laptop today.

It started yesterday. The laptop had been running very slow lately.  I had previously tried to download and install Windows Update version 1709 but it was not working on my laptop so I uninstalled it and stopped the automatic updates for a couple months.  I accessed Settings yesterday and saw Windows Update was attempting to download and install update to Windows, version 1803.  I let the update run and download.  When I attempted to install the update, it could not be installed because the April 2018 update was not installed.   I know nothing about this April update.  Usually, I would receive an email about an update but did not.

Today, I tried again to install the update.  My system was running so slow, I tried to do a system restore but could not be done, it said due to the anti-virus application installed.  I uninstalled Kaspersky Internal Security application.  The system seems to be running a little better.  I attempted to run Dell Support Assistant but it would not open.  I ran the repair option and reset option and it still will not open.  I uninstalled and reinstalled it and it still will not open.