umm 512 mb should be enough to play, tho u could use more, and norton shouldn't be causing it, i really do not know why it will not work. if u have the new Radeon ATI graphics opengl drivers then i do not know what to do. your graphics card is a radeon, so geforce drivers wont work, delete them with add/remove programs, then try to play with only the radeon stuff installed. otherwise, i am stumped!