Hello @Bob Ross,
Welcome to Microsoft Q&A forum.
Since repairing VS doesn’t work, I may suggest trying to reinstall VS. Firstly uninstall SDK and WDK, then from VS Installer, uninstall VS and then from Control Panel, uninstall VS Installer. Download a new VS bootstrapper file from here: Downloads, put it into a clean folder, run to reinstall VS(follow this guide to choose workloads and components). After that reinstall the latest SDK and WDK from here: Download SDK and WDK. If this doesn't work, please try to reboot your machine and check again.
If you installed any other extensions or modified something on your machine, please let us know.
Sincerely,
Tianyu
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