Another hard drive question

Just got done with putting this together and I would like to transfer all the info from the old HD to the new one. I can hook it up via a USB port, but I want to know what issues I will have with the new componets and the old OP system [Win XP]
ASUS M4N78 Pro GeForce 8300 Socket AM2+ Motherboard
AMD Athlon 64 X2 6000+ Socket AM2 CPU
320 GB Seagate Sata Hard drive
Kingston HyperX 4096MB PC6400 DDR2 800MHz (2x2048)

 

What is the new Operating system and what components were changed?
The more information you can provide will enable someone to better answer you.

 

I will be installing the same OP system [Win XP from the same disk] that is on the old HDD. The new componets are a new Mobo,CPU,HDD and new memory. Everything is new except for the PSU.

 

May need to track down some drivers , but for sure,with that many changes, Windows will need to be re-activated.That should be your biggest problem.
Your machine will NOT be recognized by Microsoft due to the component differences.