Open the Start Menu, type , and press Enter . Select your drive and click Create disc . Using an ISO File
If you have a desktop, ensure the SATA cables connecting your hard drive to the motherboard are secure. A loose connection can cause the "missing" error.
Windows has a built-in tool that can automatically fix this issue. Boot from the Windows 7 installation media. Select . Choose Startup Repair from the recovery options menu.
Choose . The system will automatically scan for missing files like BOOTMGR and replace them from the secure installation media. 5.2 Manual Command Prompt Repair
