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I used WinISO. It's very easy to do it.
Just run WInISO,
Click "bootable" on the toolbar.
If you don't have the boot information, you need to insert an existing boot information into the file.
Press the "Set Boot Image" Select your existing boot information, then click "Open".
Click "Save" to save to complete.
Here is the detailed infomation: http://www.winiso.com/support/tutorials/make-bootable-iso.html
You can download WinISO HRER: http://www.winiso.com