Windows 2008, XenServer, ESX 3.5

Hi Glen, welcome to NeoSmart Technologies.

Can you define "stuck"? How far have you gotten? What have you installed?
I would like to know also, I have a similar complex multi-boot with Vmware ESXi loaded on a dedicated drive and trying to setup booting with this drive.
To the best of my knowledge (not having tried it myself), ESX uses GRUB to boot. Try setting it up as a generic Linux entry configured as "GRUB" in EasyBCD; see what happens from there-on.