When my computer is restarted or turned on, and I go to World of Minecraft. It says something about "The applet should pick up when restarted, I click ok... And when I go back to World of Minecraft it has all this stuff then Failed to run minecraft. Then Press any key to continue. I re-download the minecraft.jar and place it in lib and it works, then when the computer is restarted or turned on the next day it does the same thing over and over...

Why is this happening?