Microsoft actually lets you download install media for Windows 7 and Windows 8 these days. You just need the license key. I haven't tried that for OEM, though.

Microsoft actually lets you download install media for Windows 7 and Windows 8 these days. You just need the license key. I haven't tried that for OEM, though. http://www.microsoft.com/en-us/download/windows-usb-dvd-download-tool http://www.microsoft.com/en-us/download/windows-usb-dvd-down...