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:

I contacted MS support and was told that:

MS Agent: Actually HP computers are not the only product affected for this issue other computers as well like DELL etc. That’s why for now, we’ve temporarily paused the update for people who seek to check for updates, to investigate an isolated reported issue and will make it available for download again once ready.

Me: Ok, so this is known issue for 17763.55 cumulative update?

Agent: That’s correct and other issue has been reported as well but our higher level of support already working on it

To round out the description, the reference to Bleepingcomputer points to a series of comments that start with confuishus:

KB4462919 BSOD’s all HP workstations we tested on so far. Cant do system restore, recovery point, etc. Have to re-image. Dont kick this out until it gets revised or you fully test. All BSOD shows Stop Code: WDF VIOLATION.

Followed by this comment from goddo:

Problem fixed for us, we had to delete the HP driver “HpqKbFiltr.sys” in order to avoid the WDF VIOLATION on every boot. All the machines that were affected are now running fine for us after removing that driver.

And then this, later, from goddo:

It is not the KB4462919 update that is causing this crash at all, it is the failed install of the “HP Development Company, L.P. – Keyboard -7/11/2018 12:00:00 AM –” in Windows update. Before this update the HpqKbFiltr.sys driver does not exist. So in our scenario it is safe to install KB4462919 on these machines. This may not be the case for all but I thought I should let you guys know.

On AskWoody, an anonymous poster says:

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