I fitted this to my old pc which only had USB 1.1 It couldn't have been easier. Open the box, push the card in to the slot, secure with one screw, close the box, switch on and hey presto you have 4 USB2 ports all working. Not quite sure why the 5th port is internal, not much use to most people. I happened to have a 0.5 meter extension lead which I connected to this port and fed to the outside of the case so I now have 5 usable ports.
To sum up, excellent product, thoroughly recommend especially at that price!