Unable to start Windows XP after Windows 10 upgrade

First a little clarification. I had Windows 7 installed on one HDD and XP installed on secondary HDD. When I initially installed W7, it set up a boot screen which enabled me to access and run XP. After I upgraded to W10 and I try to start XP by booting from the secondary HDD, it pops up with the W7 boot select screen and, when I select to run "Earlier version of Windows", it goes to a black screen with no HDD activity.
Before you ask why I still have XP, I run a number of programs for design and game modding which are NOT compatible with later versions of Windows, even when using the so-called compatibility modes.
Is there any way I can eliminate the residual W7 boot select screen?

When you upgraded to Win10, it overwrote the Win7 boot files. So, are you saying you get two boot screens -- one for Win7 and one for Win10?

Mark Phelps said:

When you upgraded to Win10, it overwrote the Win7 boot files. So, are you saying you get two boot screens -- one for Win7 and one for Win10?

No, when I start the computer, it defaults to Windows 10. When I use the motherboards "Select boot disk" function to boot from the secondary drive I get the W7 boot select screen with no reference to W10.

AddRAM said:

Try EasyBCD.

EasyBCD - NeoSmart Technologies

You should have unplugged the XP drive before you upgraded 7 to 10.

Thank you very much! Downloaded and ran BCD. Added W-XP using its automated search. Rebooted and everything worked perfectly! Kudos!