BobAtVandy wrote:
(Warning: I'm PC-proficient, but new to handling digital images.)

I recently bought a Canon A75 digital camera. I'm very happy with
it, but the photos that are displayed on my monitor are too dark. The
images displayed on the camera's LCD screen are great -- very
true color, and very good brightness.

Try calibrating your monitor:

http://www.jasc.com/support/kb/articles/monitor.asp

Cheers,
David