QUOTE
I am wondering if I can use this program to create an ISO image of an existing bootable CD?
Sure. Please do it this way:
For imaging:
1) Put your original bootable CD to a CD/DVD drive
2) Start UltraISO
3) Press F8 to make an ISO image
For burning:
1) Put a blank CD-R to a CD/DVD writer
2) Start UltraISO
3) Open an ISO image
4) Press F7 to burn