Remove Everything And Reinstall Windows option

            This option (called Reset Your PC in Windows 8.1) removes all apps and user data, including user accounts and personalization settings. This option is useful when you plan to sell or give away an existing PC or reassign it to a new employee.  Because this process, by design, involves significant data loss, the user must click through multiple warning screens that clearly describe what’s about to happen. The reset process also includes an

option to scrub data from the drive so that it cannot easily be recovered using disk utilities. As Figure 9-4 notes, the Fully Clean The Drive option can add hours to the process. Note that this option, while thorough, is not certified to meet any government or industry standards for data removal. 

During a reset, the PC boots into Windows RE. If the system contains multiple partitions that are accessible by the user (such as a dedicated data volume), the user is given the option to format the entire drive or just the Windows partition. All user accounts, data files, settings, applications, and customizations on the Windows partition are removed. The recovery image is applied to the newly formatted Windows partition, and a new Boot Configuration Data store is created on the system partition.  When the system restarts, the user must go through the standard procedures for setting up the PC and creating a new user account, a process formally known as the out-of-box experience (OOBE) phase.  The reset option doesn’t completely eliminate the need for recovery media, which is still required for the following scenarios:  If operating system files have been heavily corrupted or infected by malware, the reset process will probably not work.  If there’s a serious issue in a rollup update that is more than 28 days old, the reset might not be able to avoid that problem.  If a user chooses the wrong language during the OOBE phase on a single-language SKU, a complete reinstallation might be required.