I have been playing Minecraft since Alpha, and this has never happened until recently (please note that I did not make any changes to my computer or Minecraft). I start the game, and everything works normally. I do my normal things without lag, until around 2 minutes later the game turns all stretched with multiple colors then crashes and it says my video card has stopped working. Any help, because I tried force updating multiple times?
I don't think its the software thats not working. I would go with what you were told, your video card is messed up. Try updating it, or seeing if it is only affected by Minecraft.
Graphics Problem