how to get windows 7 to use MS XP from installation of XP on a different partition

[backtothefuture]

Have got Win 7 (64bit) installed on a new partition... previously been using Win XP Pro (32 bit)

I already have MS Office installed on my Windows XP partition, how can I get Win 7 to use that without having to re-install it?

thanks

 

[Burnsy2023]

You can't. You need to install it in both OSs.