The Color Quality And The Screen Pixels

I have this Problem everytime i start my computer The Color Quality And The
Screen Pixels change !

The Color Quality Change to the lowest (4 Bit) and the Screen
Pixels change to 800 by 600 pixels !

soo EVERYTIME , i start the computer I NEED TO CHANGE IT BACK to highest (32
Bit) and 1024 by 768 !

And i cant even play games ! becuase it never change the games window to
1024 by 768

That I mean is , Could anyone save it or stop the screen to change it back
to 800 by 600 pixels !

does anyone have that problem and could Help Me Make It Better ! Thxs !!!