If I go to Options in my word processor, Apache Open Office, I'm able to revert the color scheme to some extent in the document but the tool/menu bars remain in negative. For example, when I go to Color Options for the taskbar, the controls do not respond. I've been able to revert my desktop using the Invert function on Magnifier but all my Firefox, Explorer or Chrome browser windows, folders and apps, along with my taskbar, display in negative and many parts are impossible to read. I'm embarrassed to say I hit an unknown set of keys - I think they might have been: ctl-shift-tilde-scrolllock-9 - for no good reason and my display went negative and is now stuck there.
