do XP first then Vista ... but since you already did ...
this what you do .... boot to XP ... then exit .... when you boot again .. put in your window vista disk ... and choose option repair ... this is where vista will load a bood driver and fix your problem..
and when you go into vista.. you will have an option to choose which one as default ... you can set your timming of how long to wait before they go into the default operate system .... and anytime you want to change anything .. have to do inside Vista .....
also easyBCD you load in vista if you want to change the name the display in boot screen...
good luck
this what you do .... boot to XP ... then exit .... when you boot again .. put in your window vista disk ... and choose option repair ... this is where vista will load a bood driver and fix your problem..
and when you go into vista.. you will have an option to choose which one as default ... you can set your timming of how long to wait before they go into the default operate system .... and anytime you want to change anything .. have to do inside Vista .....
also easyBCD you load in vista if you want to change the name the display in boot screen...
good luck