My eHome infrared transceiver was actually a physical usb device; If you have something such as a media remote control which has a usb receiver, just try unplugging it if it's not necessary.
After a quick google, if it's greyed out, it seems to be deemed necessary by the computer; what happens if you try to disable it in safe mode?
There seems to be various work arounds in terms of regedit and pissing about with the registry, but unless you are confident in what you are doing, I wouldn't suggest that.