How can I tell which driver is causing "Driver PNP Watchdog" BSOD? [UNSOLVED - Reinstall from scratch]

Situation I realized the other day that my mother's PC hasn't succeeded at a Windows 10 feature update for more than two years. It is currently running 1803, installed in June 2018. The update history log has multiple failure entries trying to update to 1903, 1909 and 20H2, most failing with code 0xc1900101. When I try it manually through Windows Update, the new version is downloaded and supposedly installed , but when it reboots, during the black screen with blue Windows logo and the circling dots, there is the BSOD with Driver PNP Watchdog error, then the installation rolls back to 1803. Som

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