computer try to start wrong copy of windows

[wr981st]

I have windows 10 on my computer and I installed windows 7 on another hard drive after I removed that hard drive and restart computer it try's to start windows 7 that is not there brings me to screen to boot windows 7 or arrow down to boot windows 10 if I don't arrow down to windows 10 it try to boot windows 7 so I get error

 

[lolnole]

Windows Boot Manager does not know that you removed the other drive. Boot into Windows 10. Type in "System Configuration" in the search bar and open the System Configuration control panel. Click on the Boot tab. You should see an entry for Windows 7. Delete it. That should remove it from the Windows Boot Manager.