Final answer:
To find out what process is responsible for the error received during workstation boot up, the technician should first use the Event Viewer utility. This tool logs and provides details on various system events and errors, which can help pinpoint the problem.
Step-by-step explanation:
When a technician receives an error every time a workstation boots up, the first utility to use to diagnose the issue is the Event Viewer. This utility allows the user to review event logs and error messages that Windows operating systems generate and store. If a specific process causes the error during the boot sequence, the Event Viewer will typically record this event with details that can help identify the problematic process. Using the information found in the Event Viewer, the technician can determine what process is responsible for the error and then take the appropriate steps to resolve the issue. In contrast, the other utilities listed may be used at subsequent stages for different purposes, such as altering startup configurations (MSCONFIG) or managing real-time running processes (Task Manager).