So I've had this HP Pavilion a1600n desktop that needs a new hard drive. My dad was throwing away his HP Pavilion a630n desktop that has nothing wrong with it just was being slow. I was going to take the hard drive and memory maybe and putting it in the a1600n. My question is can I do this? Also would it be smart to first clean the hard drive and memory on the a630n before swapping? Lastly after swapping what do I have to do, reload windows?