under copy and backup there is burn image to disk. use that, and it will burn the .iso to your cd. but If you just need to run the disk, powerISO will mount it in your computer as a virtual drive, and then you can run it like a cd.
If so and Nero is installed just double click on the file and Nero will open the appropriate burn utility (Nero Burning ROM).
Click burn and your set............
Done it a dozen times this way and it works great.