I upgraded from Vista Home Premium to Windows 7 Professional. I used the Easy Transfer program to migrate my files. I reinstalled some of my software before moving my user settings back onto the system.
I went in to change my User Account pictures and there is no option to save changes to either account. It shows the picture selection but no Save Changes button at the bottom of the window.
I'm back to hating Microsoft unless this is my user error. (and using Windows doesn't count as an error)
The upgrade has been working pretty well for Microsoft and I'm really pleased with the improved performance but get irritated by the little challenges.
So if I'm following your question correctly, you're trying to change the image you see next to the entry for your user account when you log in? If so, the button is called Change Picture, not Save Changes.