Thank you for your message.
Could you please try fully uninstalling Viewer following this guide
and then re-installing it from scratch? Full uninstallation cleans up all remaining traces of the software, so if there's a damaged/corrupted file that might be causing the issue, this should help to fix it.
In addition, please also make to add Viewer installation folder to the exclusion list of any antivirus software you might have as described here
since the issue might be caused by a/v software mistakenly blocking/removing Remote Utilities from your computer.
Let us know if this helps or if the issue persists.