Hello HIMADRIDAS2,
I'm John an Independent Advisor and a Microsoft user like you. I'll be happy to assist you today. What is your current Windows version and edition? Press Start then click Settings(Gear icon), select System then About.
Please try the following methods below if it helps.
**Press Start then search and type Apps and Features
Search Cortana on the list
Select it then click Advanced options
Click the Reset button.
Do the same with Alarms and Clock app
**Re-register built-in apps via Powershell
Windows key+X then select Windows Powershell (Admin)
copy and paste the command below then press Enter. Please ignore the red errors and let the process complete.
Get-AppXPackage | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
Restart your Computer
Kindly let me know if this helps or if you have any further concerns.
Sincerely
John DeV
Independent Advisor