How can you recover?

You have just installed a new application on your Windows XP computer and you’ve rebooted to complete the setup process. Unfortunately, your system boots normally but hangs immediately after login at a completely black screen. The only way to gain control of the system is to power cycle the computer. Which tool would provide the easiest way to return your computer to its previous configuration?

A) System Restore

B) Windows Backup

C) Add/Remove Programs

D) Windows Setup

E) A Great Big Hammer. And Heavy.