How can I invert the screen on Windows XP? Not rotate, but flip/invert horizontally? I want the text, and everything else on the screen, to go from right to left.
Try using the video card drivers. I've used this option from the nVidia and Intel video cards settings, but they're different from one manufacturer to the other.
Edit: for an nVidia card you could try NVRotate (it should come with the video card driver). If this doesn't work, just try iRotate; it's a free, very small (125KB) app that does what you need.