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Experiment with booting to the Home Premium (after the fix is done).

Then reboot to Home Premium - does it still work?

Then try booting to the Ultimate (after the fix is doen).

Then reboot to Ultimate - does it still work?

If one or the other is successful - that's the one that controls the boot (and it's the one that you have to fix the boot files from).

If you fix it from the other one, then it'll just screw things up (and probably will result in what you're experiencing now).

It's most likely the Home Premium - as that was installed first.  But subsequent repairs may have changed that, so be careful!

Once it's repaired, then use a tool such as EasyBCD to control booting:  http://neosmart.net/EasyBCD/