I do not know if there is a work around for this but my understanding is that for an upgrade disc the upgrade to Vista "disables" the XP already installed. Dual booting from an upgrade thereby being unachievable legally.
Surface Pro (2017) vs Surface Pro 4
20 groundbreaking 3D animation techniques
How to mine Bitcoin on Mac
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.