Hello,
Please try these suggestions:
Run System File Checker scan:
- Search for 'command prompt' using Cortana or Windows Search.
- From results, right click on Command Prompt and select Run as administrator.
- Type sfc /scannow command and press Enter key.
- Let the command complete and then reboot the machine.
If that doesn't works, try these steps:
- Search for 'windows powershell' using Cortana or Windows Search.
- From results, choose Windows PowerShell and select Run as administrator.
- Then type/paste following and press Enter key:
Repair-WindowsImage -Online -RestoreHealth
- Let the command complete, restart your system then.
If problem continues, perform clean boot and remove third-party programs slowing down your system:
https://support.microsoft.com/en-in/help/929135/how-to-perform-a-clean-boot-in-windows
Also, try updating to Version 2004 or latest version and see if it helps.
Hope this helps!