Well since you are just switching HDD's you are not switching PC's according to M$. According to M$ you have to switch Mobo's and Processors for it to be considered a new PC. So you would be safe just installing it again on your new HDD.
The File and Settings Transfer Wizard is located at Start>All Programs>Accessories>System Tools
That is what you use when you install XP on a new machine and want to transfer over your old settings and that. I dont know how well it works since i have never personally tried it.
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Phone: LG Optimus G Pro
Running: Stock JB from LG with Nova Launcher