Hello everyone. I am new to this Forum and i am facing during the past month the following problem. My PC appears to be working perfectly right when suddenly i get a blue screen and the message IRQL_NOT_LESS_OR_EQUAL followed by some warnings and then ***STOP 0x0000000A (0x00000054, 0x0000001B, 0x00000001, 0x823C1FE9) and memory dump starts. This problem appears on an irregular basis although it has increased in frequency during the last week. I have not changed any hardware since i set up this PC on September - October 2008 and cannot understand the cause of all this trouble! I would greatly appreciate any help. Thanks in advance, Nick P.S. I attach to the present the minidump files stored in my HD.