How to Fix Your Minecraft crash report

Hi, when I click play on the Minecraft Launcher, the launcher disappears for a second and then returns saying it has crashed and would I like to report it to Mojang. I Must have tried it about 20 times now and I get the same error every time! 'Initializing Game' Here's what it says: ---- Minecraft Crash Report ---- // Shall we play a game? Time: 21/09/13 10:07 Description: Initializing game org.lwjgl.LWJGLException: Pixel format not accelerated at org.lwjgl.opengl.WindowsPeerInfo.nChoosePi