ISO to CD Help

I am stupid and unsuccessful when it comes to extracting an ISO to a CDROM. I am using Win XP and would like to put an ISO I downloaded on a CD so that I can install the program. I have several ISO’s on my computer and I keep making coasters. Please tell me of software or something that will help. I prefer free software or demo software. I have the program built into XP and Nero (older version) and WinRAR. I was told that I could do it with both and keep messing up. I am desperate for help.