Auto Magic Scaling is broken, if you used it in your save, remove it and type in console:

To fix Auto Magic Scaling and remove it do the following:

1. Remove Auto Magic Scaling (thanks to Dem0nz)

2. Copy the following into a new text file and save it as Reset (Will be Reset.txt if you have file extensions showing).

Place it in the skyrim directory.

player.forceav AlterationPowerMod 0
player.forceav ConjurationPowerMod 0
player.forceav DestructionPowerMod 0
player.forceav EnchantingPowerMod 0
player.forceav IllusionPowerMod 0
player.forceav RestorationPowerMod 0
player.forceav MarksmanPowerMod 0
player.forceav BlockPowerMod 0
player.forceav HeavyarmorPowerMod 0
player.forceav OnehandedPowerMod 0
player.forceav SmithingPowerMod 0
player.forceav TwohandedPowerMod 0
player.forceav AlchemyPowerMod 0
player.forceav LightarmorPowerMod 0
player.forceav LockpickingPowerMod 0
player.forceav PickpocketPowerMod 0
player.forceav SneakPowerMod 0
player.forceav SpeechcraftPowerMod 0

3. Ingame press ~ to open console. Type bat "Reset.txt"

4. Done.