The problem I am having is this; if my character looks at a fire type light source directly in first person the screen flickers very fast between yellow and normal and the fire this mass of green/orange/yellow where the normal fire would be. This problem also effects some spells such as Flames and Healing and Dragonskin and is only in first person veiw. I am running Skyrim unmodded now, when this problem first occurred I was using mods. I have tried uninstalling completely; then reinstalling the game and this did not fix the problem. Has anyone else run into this problem and/or have any idea of how to fix it?

Your card is an ATI? You might fix the problem by reverting to previous drivers.