I had a guy in my office who decided he didn't like his wall paper. He was a Windows user with a policy editor, and he couldn't figure out how every time the machine restarted, the same wall paper came back. His first step was to blame the person that worked on the opposite shift from him, and the second was to remove the offending file.
Being a not so experienced user of four years, he decided to restart the machine in DOS, change to the Windows directory, and type in "del."