Just went out and bought the complete set Civ4 today. Putting it in my CD Drive yields this message: Windows cannot read from this disc. The disc might be corrupted, or it could be using a format that is not compatible with windows. Got the same message and problem when trying to install WotLK a few months ago. Had to end up DLing it right from the website. I'm using WinXP Pro SP3.. Could be SP2, not 100%. Im guessing my CD-Rom needs some kind of new drivers to read these new discs but im not sure what kind I have. Any suggestions on what to do?