How do I transfer a drive from a PC to another PC?

Solution
Well if it's already formatted for windows, you just plug it into a SATA data and SATA power cable in the new pc. If it's brand new and not formatted yet, it may not show up in "my computer" when you first install it. Don't panic! Just go into disk management in windows and format the drive, it will be good to go. Also, this is more obvious for some than others, but add the drive while the computer is off.
Well if it's already formatted for windows, you just plug it into a SATA data and SATA power cable in the new pc. If it's brand new and not formatted yet, it may not show up in "my computer" when you first install it. Don't panic! Just go into disk management in windows and format the drive, it will be good to go. Also, this is more obvious for some than others, but add the drive while the computer is off.
 
Solution

I'm a newbie at this sorry!
But, the disk doesnt have the windows system files, so do I still have to format it?