Microsoft's Windows Operating System has been a driving force within the Personal Computer Industry. In recent years, however, that industry has started to struggle due to both internal and external factors. The release of the latest version of Windows, Windows 10, comes at a critical time for the industry. This thesis analyzes Windows 10's overall effect on the PC Industry by looking at Personal Computer sales before and after Windows 10's release as well as Windows 10's own success by studying Personal Computer Operating System market share.