How do I modify my boot options in Windows 8?

Solution 1:

You can use the Windows buit in tool as well for this just type the msconfig in the run dialog box by pressing the Win+R.

As shown in the image select the boot entry which you want to delete and hit the delete button. For the current Windows in which you have boot this option will be unavailable.

Solution 2:

Removing a BCD entry is easy, you can use a tool called as EasyBCD to do the trick. After installing, all you have to do is remove it in the UI.

Hit the edit boot menu and remove Windows 8 bootloader.

Make Windows 7 bootloader as the default and you can boot using Windows 7 bootloader.