strange problem

[nomad2070]

hi,i am a newbie.^_^
i met a very strange problem.all my opengl programs worked well in my computer previously,but now none of them work though i didn't change anything.whenever i execute them,no error message and the drawing window poped up as usual,but one thing different with before is that there is nothing drawn in this pop up window.i am using opengl+mfc and windows 2000.btw,all other mfc programs work well,before and now.
i guess there might have some problems with the opengl related *.dll files.is my guess right?who can tell me why this problem occurs and how i can solve it?
thanks!

[Gavin]

could try some of the examples.