markitos

I had the same problem. I was recording music through my M-Audio Delta 1010LT when it froze (It had worked great for the past 6 months). I rebooted and got the blue STOP screen. This is how I resolved it: First, look up the error, "STOP 0x000000A5", on Microsoft support. It is "Microsoft Knowledge Base Article - 256841", available from the following link: http://support.microsoft.com/?kbid=256841 Look up the first parameter following the "STOP 0x000000A5" on this page and it will tell you the reason for the error. In my situation the problem had nothing to do with the ACPI. Parameter 1 was "1003 - A device is present in the system for which there is no entry in the IRQ routing table." I only had a video card and the 1010LT installed. Since the 1010LT froze, I powered down and removed it. The system booted normally. Then I reinstalled the card and everything is working fine now. I assume there was some kind of glitch that affected the IRQ system. Unfortunately, the Windows 2000 message is not very helpful in this situation. Good luck!