Solution 1 for IT professionals
HKEY_CURRENT_USER\Software\Microsoft\Shared Tools\Proofing
Tools\1.0\Override\en-US
I had 2 entries (DLL and LEX) pointing to non-existing files. if you are not able to find these two entries then please follow the solution 2
Rename these to oldDLL and oldLEX.
After that hopefully it will start working as normal
Solution 2
1. Click on Office button (top left) in word.
2. Click on word oprions button.

3. Click on Add-ins.
4. In the Manage box select “Disabled items” and click on Go.

5. In the dialog box select en-US spell checker if it is there and Click on Enable.
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