my system have 2 hard drive one with xp home and one with vista,and i always boot in to xp to do overclocking,crash,restart.... this morning i try to boot to vista,but computer still boot in xp,i reset bios ,still not work ,then i boot in to vista cd and fix the problem.it is ok with vista now but i can not boot back to xp.what thehell is it?any idea please.