*** This post is for information only ***
This will probably not concern most users but it is something I found out by accident. A friend has a laptop running Windows 7 but prefers PCLinuxOS. After downloading the iso they used Windows 7 built in application to burn a CD. All went well and no errors were reported. It wasn't until boot time that a problem was discovered. It appears that the Windows 7 burn app was unable to complete this burn correctly which I can only put down to the iso size of 699MB leaving no room for whatever Windows 7 needs to do to close the disk. The CD wouldn't boot up failing just before the end of the boot sequence with a file error message.
This wasn't a bad download or a bad CD, more than one of each was tried. A burn to a DVD with one of the already tried downloaded iso's solved the problem.