This occurred once on startup, some time ago, can’t remember what I had done before. Recently, I get a BSoD almost every time. It occurs towards the end of startup, just when it seems that things are OK. Once the system manages to stay on, it doesn’t occur again, till next startup. Error messages: DRIVER_IRQL_NOT_LESS_OR_EQUAL STOP: 0x000000D1 (0x5E8CE7B6, 0x00000009, 0x00000000, 0x5E8CE7B6) My Error Event 1001 agrees with above:. The computer has rebooted from a bugcheck. The bugcheck was: 0x000000d1 (0x5e8ce7b6, 0x00000009, 0x00000000, 0x5e8ce7b6) My system: XP Pro SP2. I’ve installed SP3 but the problem continues just the same. I searched, but could not find clear cause and solution. Any help will be greatly appreciated, especially in the stressed condition I find myself. Thanks in advance to anybody replying.