Check the DVD for dust, fingerprints or scratches. CRC errors can be the result of a damaged disk (which may or may not be visible), or a conflict / problem with the drive or system.
In Windows Explorer, try manually copying the textures.dv2 file from the disk to the corresponding folder on the hard drive.
Divinity II - Ego Draconis\data\Win32\Packed\Textures.dv2
Try a different optical drive, if possible. Another drive may be better at reading the disk, or the one you tried could be starting to fail. If you bought the game at a computer store, or a game store with a demo system set up, they should be willing to check if the disk is readable there.
Also, shut down all non-essential programs (especially anti-virus) before trying to install the game.