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#2160
Transfer the Win7 installation including MBR, Track0 and Active flag, auto-drive letter to preserve C boot. If necessary confirm Active partition and Run Startup Repair til it boots.
Then apply XP to its partition without any if those except auto drive letter selection to preserve C. Afterwards from Win7 install EasyBCD to add XP to Boot Menu.
Based on the hundreds if not thousands of posts I've helped solve in this thread the possibility of something unseen in your config interfering with this is good. But I'm giving you generalized steps since I only had enough time to read your screenshots now tonight.
Norton is one of the least favored apps here during our entire run.