I have a new PC with XP-Pro from a PC assembler. The copy of XP Pro that I received with the new PC is just a reinstall version. So if I want to repair the current install it will overwrite everything and I have to start from scratch.

I kept a full version of XP pro that I had installed on my old PC. I erased all info from the old PC before giving it away. Can I use this old full version of XP-pro and do a repair on the existing new PC with running into problems with the product keys conflicting?

Thanks, Richard