All of a sudden, when i try to use fireball destruction spells, or Sanguine Rose staff, i get massive flashing on my screen. With the staff, it is a ball of flashing green and red in the area where the staff was pointed to, but it covers maybe a quarter of my screen. When i attempt to use fireball spells, my entire screen flashes this way. It started when my computer kept crashing (screens would go black, while fans, etc kept running...had to restart computer each time). So i updated the driver for my graphics card, and now i have this problem. I have also tried reinstalling the game, but it did not seem to do anything to help. Any help would be appreciated. Thanks.