MundoDragon :
It really depends on how old it is. Older drives used an interface call IDE, whereas nowadays the standard is SATA. Very few motherboards these days include IDE on the board. If the drive is an IDE (sometimes referred to as EIDE, as well) and you are dead set on using it, you may be able to find and purchase a PCI IDE controller that you could use to interface with the drive, but I doubt any drive that used IDE would even be worth it as it is sure to be very low capacity by today's standards. With the price per GB so low on modern drives, it's just more practical and efficient to buy a new drive. As for the Authenticity Key for Windows, if it is a legitimate version of Windows (i.e. not pirated), you may be able to get the key by calling Microsoft if you have the original CD/DVD. Good luck and Merry Christmas.
GigginsMcSwag :
MundoDragon :
It really depends on how old it is. Older drives used an interface call IDE, whereas nowadays the standard is SATA. Very few motherboards these days include IDE on the board. If the drive is an IDE (sometimes referred to as EIDE, as well) and you are dead set on using it, you may be able to find and purchase a PCI IDE controller that you could use to interface with the drive, but I doubt any drive that used IDE would even be worth it as it is sure to be very low capacity by today's standards. With the price per GB so low on modern drives, it's just more practical and efficient to buy a new drive. As for the Authenticity Key for Windows, if it is a legitimate version of Windows (i.e. not pirated), you may be able to get the key by calling Microsoft if you have the original CD/DVD. Good luck and Merry Christmas.
The hard drive I plan on using is a SATA hard drive. So could I use KeyFinder to write down the activation key then use that?
If you reinstall the OS, should be no problem.
Magical Jelly Bean can find that license key.
Assuming Windows 7, go here and download the relevant ISO for the install:
http://www.w7forums.com/threads/official-windows-7-sp1-iso-image-downloads.12325/
But trying to move a drive with an exiting OS between PC usually will not work. You must reinstall.