So i'm looking to upgrade my 07 tower's motherboard which is still stock. its a Asus computer and it runs intel I5 core as is. from what i have learned by asking around at computer stores, when i install the new board i need a CD key for my original windows 7 from 7 years ago. of which i'm very sure is long gone after my second move. so, three questions;
A) would i be better off letting them install the new gear and get operational?
B) which type of board should i get (my budget is no more then $250)
C) Where can i get a CD key? and would any Windows 7 Key work?
***note***
the graphics card, hard drive,and power supply are updated already.