F.E.A.R. ruined, and the backup isn't working properly

[Panda Man]

I read the FAQ, and it didn't help. I just formatted, and when i tried to install F.E.A.R., the DVD was screwed up (VERY scratched up, scratches going in circles and destroying the DVD). Anyways, i decided to download the backup copy here from gamecopyworld, and when i mounted it with daemon tools, the autorun failed and instead i got the contents of the image. I tried to run the setup but it would not work. So i used alcohol 120%, and got the same result. Then I tried burning the image using alchol 120, and im still seeing the contents of the CD rather than than the game running itself. So i opened up a command prompt and tried running setup from there, but to no avail, i got an error message saying that the program is too big to fit into memory. I tried moving all the files into a folder, and running the setup from there, and that has not worked. Has anyone had this problem and can does anyone know the solution? thanks in advance!