CIR Header on ASRock A75M-ITX

I built my first HTPC using the ASRock A75M-ITX board; so far, I'm very pleased with it. One area that's a little head-scratching, however, is with its CIR Header (which I want to enable in order to utilize my Rosewill RHRC-11002 remote). I've hooked up my front USB cable correctly and can get the IR dongle to work in the right USB port; the left port, however, doesn't seem to do anything. The manual states that it ought to act as a normal USB port. To test, I've been using a wired HP mouse; when I plug it in, the IR beam on the bottom glows (indicating it's receiving power?), but the mouse doesn't do anything.

I've triple checked the wiring and am certain that it's correctly placed. I'm hoping that someone out there has an answer for me.

For what it's worth, I'm using Windows 7 Home Premium as the OS.

Thanks!