*To PhilC: * It's Win XP.   I always log in in the same way, so I suppose that that means I am doing so as the administrator.   Certainly, the way I was logged in when I originally installed Poser 7 will have been the same as the way in which I was logged in when the problem occurred.

*To mylemonblue: * That other link does look similar.   I have given PC Inspector a go, without dramatic results, so far.   Since I have the Poser installation file and the content installation files, I have probably pretty well replaced what was lost already, but I wouldn't want to think that I could be randomly losing folders from now on.   Losing the textures folder (as in the linked thread) would be the kind of nightmare that nightmares have nightmares about.