If you look into your user TEMP folder, you will find setup log files there. They are text files named like dd_xxxxxxx.txt. Try opening them and searching for 'Web Designer Tools'. You'll find acual error code that may help to identify the issue. You may have some Office Beta components installed. XPS/PDF writer may be the issue - look into Control Panel and make sure there is no other Microsoft Beta software is installed.
Thanks
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