Kalim, are you re-downloading the iso files? Another thing to try is use a different burning software. I've been having problems recently with Nero corrupting my Linux iso. I tried a different program and it worked great. The one I used is ImgBurn (free). I'd recommend that you don't use the discs that fail, even if the installation is successful, you might have problems later on. As far as the partitions, I can't remember exactly how the Fedora installation looks, but is there an advanced button? You might have to click on it, or something like "custom partitioning." The dual boot option, may come later on, can't remember exactly when but I know it will come sometime. In Mandriva, that option doesn't come up until the end of the installation. Exiting, shutting off or restarting is probably the only way.