While my computer was just sitting idle all of the sudden ...blue screen with Kernel_Security_Check_Failure appeared and on restart I now have a Temporary Profile and of course can not access any programs or applications. I had run a diagnose problem as well as a disk check and as the computer was analyzing a blue screen came again with Bad_Pool_Caller. I do not know how to fix this and really don't want to make matters worse. If any one can help I would be very appreciative.