This comment is to DavidR. This thread seems to have evolved into a discussion about emergency updates. If Avast will not drop random names, I have no alternative but to accept that. That is because Avast is, otherwise, such a deuce of a good product with uniquely good and well thought out features and even with the emergency updates as they are, I could not forsake Avast. The Mail Shield is miraculously good with its oh so simple to use SSL feature. I see that you also use Outpost. I have made a request to Agnitum that it makes provision for the exclusion of folders so that the randomly named emergency update files can operate silently. I made specific mention that the folders are within a zone protected by Avast self-defence. Let's see what transpires.
Back to the thread. I have never ever had a problem with Avast (4.8 onwards) and Windows XP. By contrast, I have had problems with Vista and Windows 7. It has never ceased to amaze me that Windows, from 95 onwards, is able to run well with all sorts of problems and anomalies hidden away in its registry and other places, only occasionally betraying signs of operational difficulties. This seems to be at the root of most of the problems reported in this and many other forums.
While ceasing to use XP for sensitive purposes (such as online banking) after April, I intend to continue its use for general web browsing because I am curious to see if my well laid and so far proven layers of defence are effective against the hazards that the doom mongers forecast will beset XP users. I have yet to receive damage from the gunfire of malevolent hackers after 13 years of using Windows 2000 then XP. Avast has felt the collars of malware on about eight occasions during that time but not one has passed it.
I too evangelise Avast and install it on all computers (belonging to friends) for which I am responsible for security and defence against malware. Those computers lead apparently charmed lives which I attribute to the excellence of Avast. Those users could not cope with a HIPS so randomly named emergency updates are not an issue for them and their equipment.