If your PC is 1yr. old it will have USB2.0 that usually allows USB1.1 compatibility. The issue of USB3.0 is going to be stated as that's a selling point for any new PC. However, you didn't state what your PC maker was or model#. Most OEM makers provide the specs of what they contain, so review them or check manual. USB3.0 is more readily ID'ed by the "blue color" of ports or a different color scheme, though that may not apply to every brand out there.
I just read the review of USB 3.0 drives and want to buy a new drive for backups on my system. My Window 7 PC is about a year old but I do not know if it has USB 1,2,or 3. Is there a way in My Computer or the Device Manager to tell what version of USB I have? Thanks.