There may be some hardware-specific bug in Zoom Player. Or just some option you overlooked. Other way of adjusting is through codec settings (not all codecs have this), try playing some video and look in properties of the currenty used video codec. For example i use ffdshow as decoder for most formats, it has built-in options for color control (although i preffer player controls). Also check in the codec settings that the video output options (if available) match those in the player. You may also try all this on Win98 too, as driver options sometimes differ between XP and 98. [EDIT] I just tried Zoom Player on my Intel830 based notebook. No luck, color settings don't work using player controls. But i was able to change gamma, etc. using ffdshow color controls.