Sorry to slow down your euphoria, but this issue still exists with version 8. We had a customer complained about 2 PCs with windows updates freezing at 51%, who had never any problems with that back in version 4 for years.
Support tells us, this is not an avast-related issue since virusprotection is not active in this state of the boot process. Strangeways we always did the following: turn off the pc, restart in safe mode, uninstall avast, reboot, install windows updates, reinstall avast. Not a real solution but it works and the customer can continue with his work.
But we'd really like to solve this annoying issue since we discover freezed pcs while installing windows updates every month.