Run PowerISO.
Click the "New" button on toolbar or choose the "File > New > Data CD / DVD Image" menu.
Click on the "Add" button on toolbar to add files and folders. You can also directly drag files and folders from Windows Explorer to the PowerISO window.
Choose the menu "Action > New Folder" to create a new folder.
Choose the menu "Action > Change Label" to change the default label.
Choose the menu "File > Properties" to set the iso file properties.
Choose the menu "Action > Boot > Add Boot Information" to load a bootable image file.
Click on the "Save" button on toolbar, or click on the "File > Save As..." menu.
Save the bootable iso file to "Standard ISO Images (*.iso)" format.