OpenGL problem

hi,i didn’t know where to post ,sorry if i’ve posted in the worn section…
so my problem is the OpenGl version,the version was 2.1 before…
and now is 1.1,i don’t know how it turned like that,but i really need your help…
i tried to update it,but no use…
my video card is MSI N9500GT MD1G-OC/D2