# HP Elitedesk 800 G4 WDF_VIOLATION error

HP EliteDesk 800 G4 systems may experience a <span class="caps">BSOD</span> upon startup after the installation of Windows 10 October 2018 updates.

Update 12 October:  
Microsoft fix posted, KB 4468304.  
[https://support.microsoft.com/en-us/help/4468304](https://support.microsoft.com/en-us/help/4468304)

If you are seeing a <span class="caps">BSOD</span>, please go to “Scenario 2”:  
[https://support.microsoft.com/en-us/help/4468372/hp-devices-may-experience-blue-screen-error-wdf-violation-after-instal](https://support.microsoft.com/en-us/help/4468372/hp-devices-may-experience-blue-screen-error-wdf-violation-after-instal)

Original article:

To resolve this issue, in Windows 10 Startup Repair, enter a command prompt, go to \\windows\\system32\\drivers , and delete hpqkbfiltr.sys .

Reboot and the system should roll back the latest updated attempted. You will then need to run Windows Updates again to re-apply the latest updates, which should install successfully.

Source:  
[https://h30434.www3.hp.com/t5/Desktop-Operating-Systems-and-Recovery/HP-Elitedesk-800-G4-Bloatware-and-bluescreen-issue/m-p/6857912](https://h30434.www3.hp.com/t5/Desktop-Operating-Systems-and-Recovery/HP-Elitedesk-800-G4-Bloatware-and-bluescreen-issue/m-p/6857912)