Troubleshoot problems opening the Start menu or Cortana

CLICK HERE TO DOWNLOAD THE TOOL (START MENU TROUBLESHOOTER)

Or To Reinstall Windows apps Launch the Task manager and open a new PowerShell window with administrative. Copy the line below and paste it into the PowerShell window by simply right-clicking at the blinking PS 

Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

If the Mail and Calendar apps are not open/working on Windows 10

You may try to uninstall the apps which came inbuilt with Windows 10 using Windows PowerShell and reinstall using Windows store. Follow the below steps to uninstall the Mail and Calendar apps.

1. Open the Start menu, type Windows PowerShell in the search bar.
2. Right click on the Windows PowerShell and select Run as administrator.
3. Enter the below command to reinstall the Mail and calendar app.

get-appxpackage *microsoft.windowscommunicationsapps* | remove-appxpackage

After performing the above steps, install the Mail and calendar app form the Windows store.

Here are some things you can try if you’re having problems opening the Start menu or Cortana.

Note:

Cortana is available only in certain countries/regions, and some Cortana features might not be available everywhere. If Cortana isn't available or is turned off, you can still use search.

Check for updates

If you can't open the Start menu or Cortana, first check for updates.

1. Press Windows logo key  + R, type ms-settings:, and then select OK. This opens Settings.
2. In Settings, go to Update & security > Windows Update, and then select Check for updates. Install any available updates and restart your PC if required.

Restart your device

If you didn’t have any updates that required a restart, it’s still a good idea to restart your device to make sure any pending updates are installed.

Try the troubleshooter

For assisted support, try this START MENU TROUBLESHOOTER. After you've completed the troubleshooter, restart your device.

Create a new local administrator account

If you still can’t open the Start menu or Cortana, try creating a new local administrator account to see whether you can open the Start menu using that account.

If you're signed in with your Microsoft account, remove the link to that account first by doing the following (otherwise see "Create the new administrator account"):

1. Press Windows logo key Windows logo key  + R, type ms-settings:, and then select OK. This opens Settings.
2. Select Accounts  > Sign in with a local account instead.
3. Type your Microsoft account password and select Next.
4. Choose a new account name, password, and password hint, and then select Finish and sign out. 

Create the new administrator account: 

1. Press Windows logo key Windows logo key  + R, type ms-settings:, and then select OK.
2. Select Accounts  > Family & other people (or Other people, if you’re using Windows 10 Enterprise).
3. Under Other people, select Add someone else to this PC.
4. On Windows 10 Home and Windows 10 Professional, provide a name for the user and a password, and then select Next. On Windows 10 Enterprise, select I don’t have this person’s sign-in information, and then select Add a user without a Microsoft account.
5. Set a user name, password, and password hint. Then select Next > Finish.

Next, make the new account an administrator account.

1. Under Family & other people (or Other people, if you're using Windows 10 Enterprise), choose the account you created, and then select Change account type.
2. Under Account type, select Administrator > OK.

Sign out of your account and then sign in to your new account. If you can open Cortana or the Start menu, move your personal data and files to the new account.

If the problem still isn't fixed, try deleting the old administrator account:

1. Under Other users, select the old administrator account > Remove > Delete account and data.
2. After the old account is removed, restart your device and sign in with the new account again.

If you were using a Microsoft account to sign in before, associate the Microsoft account with the new administrator account. In Settings  > Accounts , select Sign in with a Microsoft account instead and type in your account info. 

Reset your PC

If none of the previous options work, try resetting your PC using Windows 10 recovery options.

Applies to Windows 10

Thanking to Microsoft Support Team

https://support.microsoft.com/en-us/help/12385/windows-10-troubleshoot-problems-opening-start-menu-cortana