Introduction: USB PC REMOTE : Control PC Using Any IR Remote
It explain how to control your PC using an infrared IR remote. This method requires a tiny IR receiver which will receive the Infrared from the Remote and convert it to the keyboard key press.
This method uses a ATtiny85 microcontroller with the IR reciever TSOP module. This receiver itself acts as USB keyboard when connected to the PC using the USB, so you don't need any third party software to convert the IR into Commands.
Also the Receiver is very small and very easy to make. I have already published a video tutorial for this. Check it out.
You can also check the details at the link below.