Well it was time to upgrade that P3 850MHz motherboard and CPU to a real machine. I upgraded the motherboard, CPU and power supply. Re-installed base Win2k (no service pack) along with updated SCSI driver. The system runs great without any service pack installed. Then I installed Service Pack 3 and the system would not boot. I kept getting the following message on the blue screen: "STOP c000026c unknow hard error". I rebooted the machine a number of times and it finally booted into windows. On the next reboot, I get the following new message on the blue screen: *** STOP: 0x000000D1 (0x00000020, 0x00000020, 0x00000000, 0xBFF74908) *** Address BFF74908 base at BFF71000, DateStamp 3c7eddfb - SCSIPORT.SYS I contacted the company that makes my SCSI controller and I have the correct SCSI driver installed for service pack 3. I do not understand why it works perfectly with out a service pack installed. I have tried numerous times to get the machine to boot, but never get past the blue screen. My machines configuration is: Abit AI7 Mother Board P4 - 3000MHz Prescott CPU Volcano P4 Style CPU and Heat Sink 2 x DDR 333 CRSR 512MB NVIDIA GeForce4 Ti4200 with 128MB Initio 9100UW SCSI Controller Seagate 74 GB SCSI Hard Drive (SCSI ID set to 1) IDE CD-ROM Drive on IDE channel A Internal IDE Zip 250 Drive on IDE channel B 3.5" Floppy Drive 400 Watt Power Supply Besides, the OS and SCSI driver, the only other software installed is the video driver for the NVIDIA GeForce4 card. Does any one out there have any idea as to how to correct this problem?