If your computer cannot start, windows 7 automatically enters the system home recovery function, which is a gray progress bar. I believe everyone should be familiar with this interface. This is a system repair function provided by win7 flagship edition. The "Startup Repair" aims to diagnose and fix the problem that prevents Windows Startup, so as to avoid time-consuming re-installation. Start repair was initially introduced in Windows Vista. Now, Windows 7 automatically installs the start Repair Tool on the operating system partition so that you can access it at any time. If the startup fails, Windows 7 automatically loads the boot fix and scans the computer for problems (such as registry corruption, loss of system files, or invalid STARTUP configuration data ), and automatically fix them whenever possible, and then restart as usual. For more information about how to enable the repair feature and what operations should be performed when the feature cannot be automatically started. The following describes how to restore the Windows 7 system. 1. Fixed some problems that may prevent normal Windows Startup, such as missing or damaged system files. 2. System Restoration restores computer system files to an early point in time without affecting your files (such as emails, documents, or photos ). If you use system restoration from the "System Recovery options" menu of Windows 7 flagship edition, you cannot cancel the restoration operation. However, you can re-run the system restoration and select other existing restore points. 3. To restore a system image, you must create a system image in advance to use this option. A system image is a personalized partition backup that contains Windows, programs, and user data (such as documents, photos, and music ). 4. Windows Memory diagnostic tool scans computer memory errors. For details about how to use the Windows 7 memory diagnostic tool, see how to use the Windws memory diagnostic tool to check the memory reliability. 5. The Windows 7 command prompt is provided to advanced users. I believe you will still remember how to completely install Windows 7 in the XP system by using a command prompt. You can call the win7 standard installer directly in a command prompt to call the hard disk partition function of the installer.