Lack of large 4:3 flatscreens / wide screen in portrait mode [closed]
Solution 1:
As you suspected, you might run into problems with Clear Type font smoothing when in portrait mode since it assumes a vertical array of RGB (or BGR) pixel bands.
Try running the Clear Type Tuner (Control Panel on Windows 7 or download for Windows XP). If this doesn't give reasonable results, try using old-style anti-aliasing instead (an option in Windows XP) or switching off font-smoothing altogether.