Please try these options one by one and check after each option. These options are independent and can be executed in any sequence.
1. Click on below and run Start menu troubleshooter
http://aka.ms/diag_StartMenu
2. Reinstall Cortana
Windows Key+X > Click Powershell(Admin) > Copy the below and paste into Powershell by right clicking into Powershell
Get-AppXPackage -Name Microsoft.Windows.Cortana | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
Reboot your computer
3. Update display driver
Windows Key+X (Or right click on Start) > Click Device Manager > Expand Display Adapter > Right click on entry below > Click Update Driver Software > Click Browse my computer for driver software > Click Let my pick from a list of device drivers on my computer > Choose the driver > Click Next to update > If this does not work, select Search automatically for the updated driver in place of Browse my computer for driver software > Restart your computer
4. Update display driver from manufacturer's website
Go to the website of the display adapter's manufacturer or computer's manufacturer > See if some driver is released for your model and OS > If yes, download that > In previous option, you click Update Driver Software, in place of this, click Uninstall > Install the downloaded driver > Restart your computer
OR
https://www.lifewire.com/how-to-find-and-downlo... (Thanks to Rob, MVP for the link)
5. Rollback the Driver
Windows Key+X > Click Device Manager > Expand Display Adapter > Right click on entry below > Click Properties > Go to Driver tab > If there is rollback option, click it
6. Create a New User Account and login with this new User Account to rule out corruption in user profile
https://support.microsoft.com/en-us/help/402692...
7. Run through Windows 10 Performance and Install Integrity Checklist by Greg Carmack, MVP to make sure that your Windows installation is rightly set up and optimized. Take all recommended steps outlined there to have best experience -
http://answers.microsoft.com/en-us/windows/wiki...
8. If nothing works, perform a Windows 10 repair upgrade. Repair upgrade fixes all Windows errors and retains all files, applications and settings. Below is a good guide to perform repair upgrade by Andre Da Costa, MVP
http://answers.microsoft.com/en-us/insider/wiki...
Sources
https://answers.microsoft.com/en-us/windows/for...
https://www.drivereasy.com/knowledge/windows-10...
