Issues with WOW Freezing then Rebooting Computer

I have spent all day today trying to remove items from my computer to fix this issue. I keep playing and it freezes up and reboots my computer. I have updated the Nividia graphic card. It has gotten worse since Tuesday’s update. Previous to the update, I would randomly freeze at inopportune moments (i.e, while killing a boss, flying through the rings, etc.) Weekends should be time to play WOW ad nauseum; however, today, I’ve spent about 10 hours working to fix this problem in my system though it sounds like it is a Blizzard issue since I’ve read so many people are experiencing the same issues.