I'm playing Oblivion for the second time. The first time was on a PS3, but I gave up because of the bugs. This time I'm playing it on a PC. I downloaded the version through Steam, which supposedly has all the bug fixes pre-installed. In spite of the bug fixes, I'm having a problem with the Vahtacen quest. The chest with the necessary spells has only three of the necessary four spells in it. I acquired a frost spell independently ( the missing one), but the game doesn't seem to recognize it. I got through this quest on the PS3 and successfully opened the pillar. Is there a solution to this problem? I would like to continue to advance as a mage.