I am feeling rather stupid as I can't find a menu that I know is somewhere in my computer, as I have used it before, but I'm blowed if I can find it.

My computer grinds exceedingly slow these days but I don't want to get a new one and have to learn Windows 7 and updated Office until I have finished with the annual magazine I edit at the start of each year. Santa brought me a new digital camera, and I downloaded the accompanying software without apparent problems, but the trouble is that ArcSoft MediaImpression Photo Viewer has now completely taken over and insists on opening all my .jpgs. It is a nice enough program, but it seems to take 15 seconds to load each .jpg, so I want to try and set my default viewer back to the Windows one. Then tonight my Outlook e-mail editor seems to think it is set to Word.

Somewhere I know you can say which you want to be your default image viewer, e-mail editor etc, but can I find it?