Cannot log into xp after vista ultimate install

Hi, wondering if anyone could give me some help please.
I have had windows xp pro installed on my D: drive for a while. Decided i wanted to try out vista 64 ultimate, so formatted my C: drive and installed it on there. Vista loads up fine and seems to be pretty good. I was hoping to have a dual boot system but i do not get the choice of operating system on startup. I have browsed a few forums and i think that my boot file was installed on my C: drive for windows xp before i formatted it.. DOH! Is there a way to get around this problem? Ty :confused

 

I've used Easy BCD to fix that, and it worked great:
http://neosmart.net/dl.php?id=1
i couldn't find a download link here at mg's.
here's something similar:
http://majorgeeks.com/VistaBootPRO_d5625.html