i got the game and well logged in and everything but when i started the game i didnt start i gives me a error that says couldnt set pixel format

Couldn't set pixel format
org.lwjgl.LWJGLException: Pixel format not accelerated
at org.lwjgl.opengl.WindowsPeerInfo.nChoosePixelFormat(Native Method)
at org.lwjgl.opengl.WindowsPeerInfo.choosePixelFormat(WindowsPeerInfo.java:52)
at org.lwjgl.opengl.WindowsDisplay.createWindow(WindowsDisplay.java:247)
at org.lwjgl.opengl.Display.createWindow(Display.java:306)
at org.lwjgl.opengl.Display.create(Display.java:848)
at org.lwjgl.opengl.Display.create(Display.java:757)
at bib.at(SourceFile:622)
at bib.aq(SourceFile:458)
at bib.a(SourceFile:404)
at net.minecraft.client.main.Main.main(SourceFile:123)

that all that says