In addition to that, it is seldom that you downgrade a Microsoft operating system and it works ... try doing that, downgrading from XP to 98 and you will see the message:
"system files were changed, you can't go back or restore to your previous operating system".
I assume that you have Vista installed from the beginning, so no way you can downgrade. What you can do is formatting the current one and install a fresh copy of XP or as the members said.
Dual boot Vista and XP, but there are some steps you have to follow ... otherwise you would be able to boot and see only one of them ... especially if Vista is the first installed operating system ...
In addition to that, it is seldom that you downgrade a Microsoft operating system and it works ... try doing that, downgrading from XP to 98 and you will see the message:
"system files were changed, you can't go back or restore to your previous operating system".
I assume that you have Vista installed from the beginning, so no way you can downgrade. What you can do is formatting the current one and install a fresh copy of XP or as the members said.
Dual boot Vista and XP, but there are some steps you have to follow ... otherwise you would be able to boot and see only one of them ... especially if Vista is the first installed operating system ...