Hello,
Thank you for posting your query in Microsoft Office Community.
Let's try the following methods and verify the result.
Method 1: Remove Malayalam language pack, reinstall and verify the result.
- Click Start, click Control Panel.
- Double-click Add/Remove Programs.
- In the list of currently installed programs, select Malayalam language pack and then click Uninstall. If a dialog box appears, follow the instructions to remove the program.
- Click Yes or OK to confirm that you want to remove the program.
Method 2: After removing and installing language pack issue still persist try to create new user account and verify the result.
Refer link below to create new user account.
http://windows.microsoft.com/en-in/windows-10/getstarted-set-up-accounts
Method 3: If above methods doesn't help then, I suggest you to remove uninstall and install Office and verify the result.
You may run Fix it from the following article to remove the Office suite.
http://support.microsoft.com/kb/2739501
Note: Save the ‘Fix it’ before running it if you’re working on a 64 bit Windows operating.
Hope the above information helps. Try the suggestion and let me know the result at your earliest convenience.
Thank you.