So you want to take the hard drive from your old previous computer and place it in your new computer, for secondary storage?
If so, that is rather easy. Just physically install and reformat it with Windows. It gets a little more complicated if you need to copy files from it you want to keep. It looks like you want to backup files from it. In that case, physically install it and it should appear in My Computer when you boot the computer. From there you can copy your stuff over to your current hard drive.
You don't have to reformat it either. You can always just delete unnecessary files such as the Windows folder.
Let me know before you do anything so we don't delete anything important!
Edited by Gorbulan, 08 September 2015 - 03:21 PM.