Boot from the Windows 7 DVD/USB again. Step 2: On the language screen, press Shift + F10 to open a Command Prompt. Step 3: Identify your drives. Type diskpart then list volume . Note the letter of your DVD drive (usually D: or E: ) and your Windows 7 hard drive (usually C: ). Step 4: Exit DiskPart by typing exit . Step 5: In the command prompt, type the following commands (one by one, pressing Enter after each):
A: Someone accidentally compressed the C:\bootmgr file to save space. Boot to Command Prompt from recovery media and type: compact /u C:\bootmgr windows 7 bootmgr download
Now copy the BOOTMGR file directly. Assuming your DVD drive is D: and your Windows drive is C: : Boot from the Windows 7 DVD/USB again