Delete an Operating System entry in Windows

If you’ve ever had multiple operating systems or recently reinstalled your Operating System without deleting the existing windows installation,changes are that you’ll have invalid boot entries on your OS choice list.To remove invalid entries:

1. Click Start and then Click Run(alternatively,you can use the following key combination Windows Logo Key + R) and type cmd then hit Return(Enter).
2. Type the command bootcfg/query then hit Enter
3. The window above will display all the boot entries that exists
4. To delete a boot entry,say entry 1,type bootcfg /delete /id 1 (Note the spaces.Be careful not to delete the wrong boot entry,your computer will not boot if a valid boot entry is deleted)
5. The delleted boot entry will not appear anymore when your start your computer.