Hate to be the sour grape here,
Although i only burn CD-Rs, nero does a fine job of writing image files
in particularly ISOs. If u still wanted to know how to do it then what u do is:
1. Start Nero
2. If the "New Compilation" dialog box comes up, then select the "Open" button located in the bottom-right of the dialog box
Or
Click "File" then "Open"
3. Locate the .iso file
The "Burn Compilation" dialog should come up and im sure u know what to do from there.