Hello forsakenedsj,
Something has corrupted your download.
The size should be:
(4.8 GB)
Sha 1 hash - 6FE9352FB59F6D0789AF35D1001BD4E4E81E42AF
From the website:
How to install the Windows 8 Developer Preview from an ISO image
The Windows 8 Developer Preview is delivered as an .iso image that must be converted into installation media stored on a DVD or a USB flash drive. On Windows 7, the easiest way to convert this file is to use
Windows Disc Image Burner. On Windows XP and Windows Vista, a third-party program is required to convert an .iso file into installable media—and DVD burning software often includes this capability.
Note: The .iso file that contains the developer tools requires a large capacity DVD called a DVD-9, as well as a DVD burner that can handle dual-layer (DL) DVDs. Most modern burners should be able to handle this format.
Using a download manager might help to keep it from getting corrupted.
Thanks,
Marilyn