It’s been a wild Thursday morning in patch land, with lots of BSODs to go around, cumulative updates, keyboard drivers, and a cast of suspects worthy of an Agatha Christie novel.

Start with a comprehensive report on the Microsoft Answers forum, where poster Mikael Sillman says:

After installing KB4464330 (build 17763.55) [on] my HP EliteDesk 800 G3 the machine refuses to boot, ending with BSOD WPF_VIOLATION. I was able to get the PC working again using an earlier restore point. It seems that this problem at least HP machines:

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