here's a really easy walkthrough(only verified in XP).
1. Put ISO in a folder.
2. Put the common-key and backup-creator.exe files in the same folder.
3. Right click on the ISO file and select "Open With".
4. Browse to the working folder and select backup-creator.exe
5. Choose to run backup-creator.exe***
*** If backup-creator.exe does not show up in the list of programs after you have browsed to it and selected it, you need to rename it.
If you are doing multiple ISO's then create a folder just for this. Do not delete the backup creator files, only delete the original ISO and the partition.iso files once you are finished burning. I found that if I deleted all files I would have to rename the backup-creator.exe to something different everytime I needed to burn an ISO. When I left the files intact and only deleted/swapped ISO's, I did not have to rename the backup-creator file.