What program can help you troubleshoot startup errors?

During the startup process of Windows XP startup, you are able to login and view the desktop. Immediately after the desktop appears, an error message in a pop-up box appears on the screen. The error message does not seem to reference a specific application and the message simply says “Error found. Application closing.” What built-in Windows utility would easily help troubleshoot this Windows startup problem?

Diagnosing a beeping computer

You’re powering up a new computer for the first time. Instead of the normal startup process, the system emits a series of beeps. No message appears on the screen, and no other lights are blinking. What is the most reasonable cause of the problem?