This is corruption of the start menu components sometimes caused by malware, sometimes not.
Sometimes if you boot to safe mode and then reboot into normal mode that will fix it.
If that does not fix it you have a corrupt install and you should backup your files and reinstall windows 10 or if you think you can
open a powershell window:
Open an admin CMD prompt and type"powershell"
then copy and paste in this: Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
hit enter and wait for it to finish then reboot.
This page has some fixes and if you google search the issue you will find more.
This is the MOST common windows 10 error
http://home.bt.com/tech-gadgets/com...g-here-are-four-ways-to-fix-it-11364000314532