do you want to boot with it, if so you will need to do a repair install.

http://www.michaelstevenstech.com/XPrepairinstall.htm


"Tiago" <Tiago@discussions.microsoft.com> wrote in message
news:5C9803C8-67E5-4EFC-AD03-35752EA789DB@microsoft.com...
> Hi,
> I am changing my computer, upgrading fron an P III 800 MHz to a P IV 775
> 3.2
> GHz.
> I wonder if it is as simple as to connect the old hard drive to the new
> computer and start using it...
> Is it?
> Can I use my old hard drive on my new computer without any procedure? Will
> I
> keep, for sure, my data (135 Gb of it...)
> Thanks in advance.