The only thing I can think of is compressing it in either a .zip file or
a .rar file. You can use WinRAR for .rar file compression and for me,
it seems to compress it down a little bit more.
Other than that, there isn't really a whole lot you can do.
1 Insert a blank CD-R into your CD drive.
2 Click "Start > Programs" and select "Nero StartSmart." Nero will then open.
3 Select "Nero Burning ROM" from the Nero 8 application list.
4 Click the "New" icon on the Nero 8 toolbar.
5 Select "CD-ROM (Boot)" from the New Compilation window.
6 Select the "Image file" button and then click the "Browse" button.
7 Navigate to the location of your bootable image file and select the image. Click "Open."
8 Click "Burn" to burn the image. Note that the process may take a while to complete, so be patient. Once the disc ejects, you've successfully made a boot CD with Nero 8.