Firstly… let me just clarify…
I came to this thread as a consequence of being unable to turn off Avast through the normal channels.
And yes it is possible to shut it down.. but not quite as norel described and only using administrative rights and having to go through several menus. Furthermore whilst Avast appears to stop for the session on restarting the PC the program starts back up!
And what?

>>When a forum member whose experience/ability level I have no knowledge of asks this sort of question (or any question, really,) my default is to firstly do no harm.<<
Well Tarq or should I call you Mr Hypocrisies “Do no Harm” you assume the level of knowledge (on the basis of a single question?) is low and give an answer accordingly rather than simply answering the question and adding a warning …?? The arrogance… get off your horse!!
>>I have seen cases of users wanting to disable their AV's because a file a "friend" sent them via MSN (or similar) won't run. Often the file is something along the lines of a free software version of a game or program that usually costs $$, or a sex tape made by the boyfriend of whatever starlets' star is rising at the time. (In case it's not obvious, such files usually come with a malicious payload. Plus you don't get to see the sex-tape.)<<
Well more fool them…. Particularly since the AV they are using will be barking like a dog if the file is suspicious
>>Some readers may form the view that this is a type of censorship. Maybe it is.<<
No it’s dictatorship actually, Avast dictating that once installed it is in charge.
And >>before posting the recipe for disaster I want to make sure the user is informed of the risks.<<
Ah that explains your initial advice to the original poster then >> In short; you don't, unless you want to uninstall the program.<<
That will do no harm Tarq!
>>In the case of greenman-23, clearly the user has a pretty good idea what they are doing, and why.<<
Whether I do or don’t is not your concern Tarq! My reasons for wanting to suspend Avast rather than uninstall it are my business not your’s or Avasts..
My reasons for searching out this thread are very simple and most clear to any normal person… “I COULD NOT TURN AVAST OFF” . it is afterall a non-system application. It is not required by the PC and to all intent and purpose is non-essential … BUT THEN I READ YOUR ARAGONT POST AND THOUGHT IF THIS IS Avasts response then bye bye Avast … come back AVG (despite your annoying barking) …
Sorry but to all of you at Avast.. if this is how you now build your program and your attitude to the people you want to use it well… frankly it sucks and you can keep it and no doubt in a few more years you will be as memorable as Zone Alarm.
Regards
Gm23
(no longer an Avast user, no longer a member of this forum)