Hi, I recently took advantage of the $15 Windows 8 upgrade offer so I have an legitimate ISO of Windows 8 Professional. Just a few days ago I purchased a new laptop and it came with Windows 8, the regular version, and I want to do a clean install on that laptop. Unfortunately I can't seem to find the regular version ISO of Windows 8 anywhere, and the recovery disks that came with the laptop are split into 4 CDs (Not even a DVD). I recall in Windows 7 you can change the ISO to any version you want, but I'm interested if anyone knows how to do it with a Windows 8 ISO. Edit: thread title updated. How do you do a clean install on an OEM Windows 8 computer? Using anything other than the stock recovery disks would result in an error message "The product key entered does not match any of the Windows images available for installation. Enter a different product key". ei.cfg also doesnt work.