Also, I notice that your color depth parameter (the fourth number after Graphics) is 0 as well - if you're not going to set the screen mode or color depth, then just leave them out. So like, instead of:
Graphics 800,600,0,0Just type:
Graphics 800,600Or if you want to set the screen mode, then something like:
Graphics 800,600,1;or 2 or 3, depending on what you want