I have a lot of experience of end users and they are
forever telling me that they get so many different "Update
this", "Update that" windows that they can no longer
distinguish real from fake. Some of them have been tricked
by fake web site pop-ups as a result, others ignore
legitimate update messages. I do not blame them.
One solution to this is to use AdBlock Plus. When a site permits adverts that threaten a computer's security, it is time to add it to the blocklist.