Phenomenal1

For the past few days my computer has been booting up. loading and getting to the desktop just fine. But all of a sudden my computer suddenly begins to blue screen and reset with the most obvious text being POOL_CALLER_ERROR. I really wish i had a screen shot. Ive been doing some research and have seen that the main culprit is newly added hardware but I haven't done anything spec wise since i bought my computer in 2008 (wireless card and extra hard drive). So if anyone has any suggestions on what I can do, it would be greatly appreciated. Also a "hard drive" that appears on the My Computer window is my Norton Backup Data. Thank You