"AV engine is not initialized" error after update to ver 12.x

CIS on WinXP-32:
AV definitions updates stoped working after automatic update to ver 12.x:
“Update failed. AV engine is not initialized”

Without more info, it is hard to give advice. I would use System Restore to revert to prior the update, then do a fresh install of the latest version

Hope it helps


Try running Diagnostics and see what it says and if it manages to fix it. It can be found under Miscelaneous.