Hey dude,
Try re-burning the CD, Also how do you burn it and What burning Program do you use?
Here is how to burn your CD so you can run it
1 - download the iso - the file name should end with a ".iso" extension
2 - open up Nero or other favourite CD burning app
3 - select - burn image to CD
4 - select the iso file, and click write
Is this the process you've followed?
Hope this Helps,
Jake