I am running a PIII 800 Dell with 80 GIG HD (XP PRO). Recently got my hands on a P4 2.6 GIG with 40 GIG (XP HOME). Can I simply pull the 80 GIG out with operating system and applications still on it and put it into the P4 as master or do I have to reinstall operating system with clean intsall? Will XP Pro be able to reconfigure for different system? Thanks Mike.