Download the Fedora 15 Live CD .iso and burn that to disk instead.
The Live CD won't have all of the extra packages that are on the DVD, but it will allow you to install the base system. Once you've installed Fedora from the Live CD, you can use yum to download and install any additional programs/packages you need.
EDIT: Another thought:
Alternatively, you could try using something like UNetbootin to install the Fedora DVD image onto an 8Gb USB thumb-drive (if you have one. If you don't, then use the Live CD instead!), then alter the boot order in your BIOS settings to allow you to boot the PC via USB.
Then reboot with the USB drive plugged in and your PC should boot into the DVD image on the USB drive.