Open source ISO burning software.
This is the Ubuntu HOWTO that talks about it:
https://help.ubuntu.com/community/BurningIsoHowto
This is the InfraFrecorder site:http://infrarecorder.sourceforge.net/?page_id=5
This is the installer for 2000/XP/Vista:
http://prdownloads.sourceforge.net/infrarecorder/ir0431_unicode.exe?download