I was wandering around in my downloads directory and ran across a program called CDview2. It is a stand alone viewer that you include on the CD you burn for them. No software for them to install and it autoruns when they drop in the CD. This is a Windows app. that runs on '98 and XP and I've tested on a machine as slow as a P-150 and it still seems to run well.
For more info I put a page up for it here
. It has a screen shot, the readme file from the program and a link to the zip file so you can download it.
Have a great weekend (or what's left of it anyway).