I came across this site that shows how to install the IR transceiver drivers on win 2008 (& hence WHS 2011)
By default you can’t use the Microsoft eHome IR Transceiver in Windows Server 2008 R2, but using this page you ‘ll install drivers to get the hardware working. These drivers were extracted from the Windows 7 x64 RTM MSDN dvd.
2. After downloading the zip extract the zip, run install.cmd as an Administrator and follow the instructions on the screen.
3. Install the drivers via the Device Manager using step 2 – 5 at the Drivers page.