Microsoft makes it easier to reinstall Cortana on Windows 10 now since Windows 10 version 2004.
Check how to reinstall Cortana with PowerShell if you have problems with Cortana.
If you have data loss problems, disk partition issues, you may turn toMiniTool software.

How to Reinstall Cortana on Windows 10 with PowerShell
Way 1.
Directly Reinstall Cortana in PowerShell
Step 1.
Open Windows PowerShell
you might press Windows + X, and select Windows PowerShell (Admin).
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Click Yes in the pop-up UAC window to open PowerShell utility and run it as administrator.
Check how to download Realtek HD Audio Manager for PC.
Way 2.
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Uninstall and Install Cortana
Alternatively, you’re free to also uninstall Cortana first and reinstall Cortana.
Open PowerShell
Step 2.
Get-AppxPackage -allusers Microsoft.549981C3F5F10 | Remove-AppxPackage
Step 3.
Learn how to download, install, update, uninstall Realtek audio driver for Windows 10.
Troubleshoot Windows 10 Realtek High Definition (HD) Audio Driver issues.
After this, reboot your rig.
kickstart your machine after finishing the process.
Why is there no Cortana on my Windows 10?
Some people reports that Cortana icon or search box is missing on Windows 10.
You may try the solutions below to get back Cortana.
Cortana might be set hidden.
you could right-click Taskbar and click Cortana.
Check Show Cortana icon to display Cortana icon at Taskbar.
Check Show search box to display Cortana search box at Taskbar.
Fix 2. you’re free to still use the Search feature if Cortana is missing.
you might press Windows + S shortcut to bring up the Search box in Start menu.
Run an SFC scan.
If Cortana is missing from your Windows 10 computer, hope the 4 fixes help you get it back.