wher you see 16bit drop it down and hopefully you should be able to set it to 32bit. Then APPLY the Change! Screen will go black and come back on
Then on the right make sure you have the 1024x768 and then APPLY to set the change.
Also go deeper into the the Advanced and then under Monitor Tab set to 60Hz if a TFT or 75Hz ish or if your using a CRT chunky back big thing