That error is: "Unserviceable slot interrupt."
In general, this type of error is caused by a corrupt operating system, Ethernet driver, or a software incompatibility between any of these and INITs or CDEVs.
Try removing and re-installing the operating system and Ethernet drivers. If that fails to solve the problem, try removing all unnecessary third-party INITs and CDEVs. If the system works at this point, re-install them one at a time and restart each time to find the culprit.