2. Then select the original ISO image of win7.
3. Then click "Save startup file" in the startup.
4. Select the directory of the boot file.
5. Then use winrar or other decompression software to mirror the original image into a folder, and put the tools you need into it and save it as a folder.
6. Encapsulate the folder into an iso image with WinMount with common tools.
7. Open the encapsulated iso with UltraISO and add the boot file saved in the first step.
8. Then click Save.
9. Then when installing the system, you can bring your own program.