The actual KB number might help us as to whether you had a routine monthly update or whether your computer just updated/upgraded to the latest 1803 version. (Of course, that's assuming you're using Windows 10 because you didn't actually tell us which operating system or which version of said OS you're using.)

In the meantime, instead of a basic restart, please try shutting the computer down completely. Wait for a few minutes then restart it again. Does that help? A full shutdown seems to be helping some machines.

Next, try running Chkdsk like this:
It seems as though the Windows 10 "upgrade" process may not install all the files correctly, or maybe they're damaged, or maybe something else, but running Chkdsk has fixed quite a few of these minor glitches. Try running Chkdsk in "repair" mode to find any damaged files and correct them. Start by opening a command prompt as an admin. RIGHT click on the Start button, choose "Command Prompt (Admin). (Or type "Command" in the search line, then RIGHT click on the "Command Prompt" listing at the top, choose "Run as admin".) Once there, type chkdsk /f /r /x, leaving the appropriate spaces between the letters as shown, then press the Enter key. You should see a note that it can't be run till a restart is done, type "Y" for yes, then press the Enter key again. Close the command prompt and restart the computer. Chkdsk will run upon restart and will take quite a while to finish.. Don't panic when the progress bar stays at 10% for a long time. It's fairly normal and the Chkdsk process may take a couple of hours.

When it's finished, it will boot to your normal startup/lock screen and you can login normally and then see if things are working correctly again.


Hope this helps.

Grif