From click here
"I had the same problem.
I solved it by copying all the files on the cd to my hard drive.
I then right clicked on the setup file and clicked on properties.
I then unchecked read-only (obviously on a disc u are not able to do that,
hence why i copied it on to my hard drive)
I re ran the installation and it installed correctly, no problem at all."
The other solution is more involved, post back if no luck