I run the Qt Demo on Windows XP.Some of the examples works quite well while some do not.For example,running the "Sample Buffers" under the folder OpenGL,it shows that "This system does not have sample buffer support".And other warnings are like "This system does not support OpenGL/pbuffers" , "The OpenGL extensions required to run this demo are missing.The program will now exit." , "Minehunt will not run properly if the C++ plugin is not compiled." and so on!
What's wrong with it ?What should I do?Thanks very much!