I Can Only Choose 16 Colours In Display Settings But I
Know My Computer Can Display 256 Somebody Help Me

you need tofindout what display cardis inyour system (even if this means taking off the cover and reading it off the chip ) then down load apropriate
driver

Go here to download and install this great program. It is Everest Home Edition, it will tell you all kind of things about your system, you can find out what video card you have, or if the video is intergrated on the motherboard, either way, then you can search this site for the correct drivers. If all you have is 16 colors, then your using the basic VGA windows driver.

http://www.pcworld.com/downloads/file_description/0,fid,23043,RSS,RSS,00.asp

Ken

ken, system detections programs such as everest can only display WHAT IS KNOWN by the system os.
as such a unknown device will stay that way wheneverest (or any other app) querys the system and asks it to report to it all that it knows. it can not determine determine devices that the system does not know.