|The red screen is usually a sign that the screen is on it's way out and needs replacing. If there's a port for an external monitor, plug one in. If that never goes red, indeed it's the laptop screen that's faulty.|
If, however, both screens suffer with the same problem, the graphics chip on your laptop motherboard is probably faulty.
As for Windows seeming to be slower to use, the above problem wouldn't explain that, unless the slowness is on the graphics side (eg slow to draw images on the screen when opening images).