Recently, virtual reality (VR) has attracted much attention. We have developed a VR learning application that simulates the process of constructing a self-built PC. Users can virtually experience the process of PC assembly with our system. Our system comprises a head-mounted display called the "Oculus Rift DK2" and a motion sensor called the "Leap Motion" that can track the real-time movement of both hands and their fingers, allowing users to move virtual objects with their hands. An evaluation was conducted after the system development was completed. We found significant improvements in users' scores between the pre- and post-tests for questions about the correct positions for installing PC parts, but not for questions about the names of PC parts. Responses to questionnaires showed that user eye fatigue was considerably improved with our VR system as compared with the stereoscopic 3D glass/display case.