I installed Windows 7 on one partition and formatted the other where I had Windows 10 installed leaving only that one Windows 7 OS on my drive, but I still have two OSs offered in Windows Boot Manager. What is even weirder is that their names are reversed, when I choose Windows 10, it's Windows 7 that gets loaded.

To delete a version from the Windows Boot Manager screen:

  1. Start the program msconfig
  2. Go to the Boot tab
  3. Select which Windows version you’d like to boot into directly
  4. Press Set as Default
  5. Delete the other version by selecting it and clicking Delete
  6. Click Apply
  7. Click OK
  8. Restart the computer.
  • Wouldn't this still leave you with showing the Windows Boot Manager with only 1 entry, which would still be inaccurately labeled "Windows 10" as OP described? Perhaps use bcdedit from cmd to correct the label? Can the Boot Manager be hidden during boot from the msconfig dialog when there is only one entry? – Blaelph Nov 8 at 23:08
  • 1
    @Blaelph: I believe that the menu wouldn't be displayed when there is only a single entry. In all cases, by reducing the Timeout value on the Boot tab one can reduce the time that the menu is displayed when a default entry is defined. – harrymc Nov 9 at 6:40

As an alternative to @harrymc's answer, you can also use the Windows command line tool BCDEDIT to configure the Windows Boot Manager from an elevated command prompt. The following instructions assume you are booted into Windows 7.

  1. to open an elevated command prompt, press Win+R to open the Run dialog, then type:

    cmd /admin

  2. to list the Boot Manager settings, type:

    bcdedit

  3. To remove another entry, take note of the entry's identifier hex string (e.g. {00000000-0000-0000-000000000000}) and type:

    bcdedit /delete {00000000-0000-0000-000000000000} /remove

  4. To rename the description of the {current} entry to "Windows 7", type:

    bcdedit /set {current} description "Windows 7"

  5. If you wish to not display the Boot Manager on boot if you only have one entry, you can use this command:

    bcdedit /set {bootmgr} displaybootmenu no

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