Thanks so much for your time, patience and wisdom guys, I ran the Windows Memory Diagnostic and there were no problems there. I set the swap file as advised, 3OOOMb initial and max and restarted. I defragged a couple of days ago, even though the analysis said I didn't need to. I have 49% free spage on my HD. I run Norton and Spybot every Friday, although whether they can catch everything is dubious. Alas, the problems with Vue persist. :( Surveyman- when you said "check to see how you specified the directory structure on installation" do you mean where the Vue program files are located? They're in C: Program Files. I guess I'll have to try reinstalling Vue again to see if that will (at least temporarily) get things running again. Many thanks, Jackson