SlackAlice was asking which version of Windows is on your new computer. (You'll also need that information for 'Field 3' in my post).
Most new computers (from places like PC World) now come with Windows 8 on them. (It's actually likely to be an updated version of Windows 8, called Windows 8.1, but it's the same driver you require anyway). If you've got Windows 8, your desktop probably has 'tiles' on it.
However some computer retailers might still be selling machines with Windows 7 on them (where your desktop will probably look like it did on your old computer).
Further, both those versions of Windows are available for two different types of computer 'architecture', called 32-bit and 64-bit. So you might have Windows 7 (32 bit), Windows 7 (64 bit), Windows 8 (32 bit) or Windows 8 (64 bit). You need to know which one you've got in order to ensure that you download the correct driver.
This helps you to check:
http://windows.microsoft.com/en-gb/windows/which-operating-system
It should automatically detect whether you've got Windows 7 or Windows 8 and show 'This PC is running: ........" near to the top of the screen. It might also show whether it's 32-bit or 64-bit but, if not, simply follow the instructions underneath.