You can. It won't be particularly pretty. With XP and that much new hardware you're probably going to have to reregister it. Then, as soon as Windows loads it's going to start detecting all the new hardware, trying to install drivers and telling you to reboot to finish the installation. If you get a problem, it will probably happen here if something in your old config has an issue with the new hardware. Otherwise you should eventually get all the hardware setup and then you should get a clean boot.