I think you want Picasa. It comes from Google (
http://www.google.com/picasa) and it's free. It does lots of good stuff:
1. it scans you computer for every picture that's there, and displays them in one place so that you can see them all together
2. it lets you do some basic edits really simply - straightening the picture up when you weren't holding the camera straight, brightening up someone's face when it's in shadow, that kind of thing (it can do more too, but the basics are really easy)
3. it saves those changes without changing your original picture, so you don't put your pictures at any risk at all
4. you can view your (changed) pictuers in Picasa, or you can send them to friends by email, you can post them on a web site that Google provides to you, or you can send them off to be printed and the prints sent to you in the mail - all from inside the program.
My mother uses it - it must be easy to use!
Of course, it doesn't do everything that Photoshop does, but it does do a heck of a lot. I would recommend starting with Picasa and, if you find you learn more about photo editing and want to progress, THEN you can move on to spending big bucks on Photoshop.
regards,
/alan