AFAIK, you cannot use the IRDA interface to receive infrared remote controls, because IRDA is a special protocol and the interface cannot be "abused" to receive other signals.
To receive infrared remote control signals, you need an additional device. The infrared receivers for your serial port are pretty easy to build.
A good source of information and software is: http://www.lirc.org/
The windows lirc port is called WinLIRC and can be found here: http://winlirc.sourceforge.net/overview.html
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