I solved the Flash seetings cannot be changed problem
I do have a Sony DSCW80. I was not changing to Flash settings. It was saying that 'Flash Settings cannot be changed'.
After I get this message I tried couple of things and I found the solution.
All you have to do is either reset to default settings or
Step 1: Click HOME
Ste2 : Click MENU
Step 3: Format the internal memory.
Then I realized that It worked
hope that hepls you too