XP + Vista Dual boot issues.. HELP!

[Doomtack]

I had XP installed at first, until i decided to dual boot with vista.
I created a second partition and made it primary, installed vista.
However when vista ran for the first time it shut down for itself, and would not allow me to boot into anything after that.
I reinstalled the vista again.... i was able to select and boot to XP, but the vista still gives the same issue...

Does anyone know how to properly dual boot vista with XP previously installed?

All the online tutorials i looked at says to do exactly what i already did...

[Fkacn_tt]

they use 2 different boot managers so after you install xp you need to use your vista dvd to do a startup repair, then you can use easybcd to add xp install to the vista boot manager, this is what i did ill see if i have the guide i used. Will modify this post if i do