How to remove Windows 10 from Windows Boot Manager after uninstalling it?

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.

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