Yawn
The OP had said he wasn't going to do the setup himself, from which I took it he was going to have someone more technically inclined do it (who I thought it safe to assume could understand SATA setup and driver installation).
You said you couldn't even remember how you did your dual boot setup, but you were pretty sure you installed XP first, and I just filled in the gap.
I mean, if you were the OP and someone was saying "yeah, it will work, it did for me although I can't actually remember how I did it, but I think this is how... but if that doesn't work, here's a link to a BCD editor utility just in case" now, would you hesitate?
There IS a difference between just getting lucky and having things all magically work, and having things all work as expected without problem because one actually knew what one was doing.
SATA modes frequently catch people out, even in Win7. Try changing to AHCI mode after unknowingly installing Win7 in IDE mode because your new mobo was set to IDE by default, and enjoy the fun!.
Hey, I'm on to your campaign of policing others' posts in the CW forums. Seems I can rarely find a forum where you haven't gotten into it with someone over something or other. Next you'll be accusing me of violating the TOS for being too geeky...
Yawn