Make sure your HD is ready for use. Reformat it and initialize as well, so once done, you can place the OS discs to reformat prior to install. The reformat process also checks the HD to see if it's OK, if any problems then that's a time it will show. If none, then start the OS install procedure. I *assume* the OS is being installed by discs, so I work from that. Being an old PIII system, the HD maybe starting to become an issue, so its important to verify its OK to use. If the problem returns during the reboot after a successful OS install, I would simply use another HD to eliminate it as a cause. For now, I exclude any other h/w that may cause a BSOD, but if it more apparent what is causing that, then report back if a different error.