Hi
I have same issue with Avast/1803 update.
Windows Update downloaded and installed the update this afternoon.
A reboot after the update completed (without any apparent issue) rsulted in BSOD.
DRIVER_IRQL_NOT_LESS_OR_EQUAL for aswStm.sys.
Booted into safe mode and after searching for the file on the disk identified this as an Avast driver. I tried to open Avast but the "UI failed to load. This is really embarassing. AV Service failed to load". Clicking the "Restart Service" button does not work.
I ran the avast installer with intention of removing Avast but did a repair instead and then rebooted successfully. Avast interface was then working as expected.
A subsequent reboot after updating the audio drivers and avast has failed again although Windows does load. Tried to open Avast and the same UI error has returned.
Have run another repair, posting this before rebooting in case BSOD's again!
Avast 18.3.2333
Windows 10 Pro - 1803 build.
** Reboot was succesfull and Avast now opens and is working. Not sure how long this will last though. Will Update post in due course.
PPS. verification image almost impossible to read and sound doesn't play