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If Cortana is not working after you upgraded your PC to Windows 10 Anniversary Update, open your Registry Editor and ensure that the value of BingSearchEnabled, as well as CortanaEnabled is set to 1:
or
make sure that you have set up Cortana in Windows 10 correctly. If after upgrading to Windows 10, you find that Cortana is not available in your region, then this post titled Cortana not available on Windows 10 can help you get Cortana on your Windows 10 PC.
Go through this entire post first and then see which one or more of these suggestions may apply in your case.
Sign out and Sign in
Sign out and Sign in or restart your PC and see if the problem goes away.
Automatic Repairs
If your PC prompts for Automatic Repair, continue with it and let Windows carry it out.
Kill and restart the Cortana process
If you find that Cortana is not working properly, the best thing to do would be to kill Cortana process and restart the process via Task Manager. If it were a minor runtime error, Cortana would just take a restart to fix it.
Disable Antivirus software
Some security software are known to create this issue – Avast for instance. Disable it and see if it makes the problem go away. If your security software is the culprit, make sure you are using its latest version – else you may want to change it.
