Whats_exploding?

Title: Game crashes Version: 3.1.2 OS: Windows 7 Java Version: version 7 update 7 Description of Problem: New to Minecraft on the pc just downloaded tekkit. After playing a for a bit the game goes to a blank screen of various colors and I am unable to do anything but turn it off and after each time I start it up again it takes less time to freeze up again. I tried uninstalling and reinstalling twice. Did not get a error message. Not sure if this is the right place sorry if it isn't. Error Messages: Error Log: