For the past few days I’ve been trying to get Windows 8 Pro (64bit for anyone who is counting) upgrade to install onto a test PC at work, however after detecting the user files the installer gets to about 4% of extracting files then errors out with the message below.

Windows cannot install the required files. The file may be corrupt or missing. Make sure all the files required for installation are available, and restart the installation.

Error code: 0x80070570

Now the odd thing was I had this message after getting the download ISO from the Volume Licence Service Centre on three separate downloads which suggested to me that there was nothing wrong with the install files.

The silly thing though is I was using 7-Zip to extract the ISO without needed to burn it to a DVD; however, once I burnt the ISO to a DVD and tried to install off of that the install went through just fine!

So maybe I needed a newer version of 7-Zip, maybe the Windows 8 ISO doesn’t like being extracted like that or maybe there was something wrong with the first 3 downloads. Either way I burnt the ISO to a DVD and it installed fine….