The program started testing the memory. I'm using a USB memory stick now as I have no rewritable CD's (it was getting expensive).
If you tell me how to upload them I can show you pictures of what happens when I run some older versions of memtest. Saying that though, now that I have jiggled my RAM about I can't find a problem with it, and I've not had the time to re-test the program since. It might be that everything was a glitch caused by wonky RAM [Technical term "Wonky RAM"].
(So this is now just a case of an irritating program that I would prefer to work)