CraigB
4
Hard to answer that one as there could be differences between the 4 systems you have and whether their all set to block new startups and how those blocks were performed, there maybe be differences in the exclusions set for avast between the other systems if you have any in place ???
The other systems might already have the emergency update or not even need it, as you can see there are just to many variables to know why your system is asking and not the others but rest assured it is an avast process.