http://dev.nsccs.ac.uk/ALEX2/alex_shellscripting.swf.html
This should run it on a browser.I did have good experience with CamStudio in the past. So I relied on it … bad idea.
The only de-motivator in my life so far is myself.
I don’t do things because I am too lazy, I can’t be asked or I don’t like doing them.
If I am in situations described by Greg and others on the forum (and I have been) I usually “fight” back. In my 42 years of living I never quite got why a human being shall keep me away from something or ruin something from me. This means an analysis of the situation Is it me? Is it them? If its them —> keep going. I have been told my written English is terrible and I shall go back to Germany (I am Austrian!) and publish in German. I got a third person on board and got some linguistic tips, rewrote the paper by myself and then got told, oh good that person 3 wrote it for you. The forum is too fragile to be exposed to what I thought at that moment. So the learning outcome was: yes, I can write papers — however I need someone to check that no Anglo-Saxon feelings are hurt. But no need to stop writing all together. No need to apply for the Pulitzer Prize either 
De-motivation should be certainly replaced with an assertive reality check. Sometimes when we teach we can come across somebody “who doesn’t get it”. So shall we tell them not to do it? Or de-motivate them? It can be often enough to get them to a certain level.
But make them aware what this level is, and offer tools how to overcome it.
External Demotivators: for me often when people don’t care — why should I??