I have Windows XP Pro SP1 and have installed PowerToys Tweak UI for XP SP1 and after restarting the system i got desktop icons in 16bit mode showing in 256 colours (before that they were showing in 16bit mode graphics). I've looked in tweak ui settings related to desktop icons , and even tried Desktop icons repair option of Tweak UI but icons still remains in 256 colours. What seems to be the problem? Thanks!