I have a Precision M3800 and had to wipe everything on the drives and load Windows 7. I need to go back to the factory 8.1 Pro image and received a recovery usb from Dell but when I boot to it the installation of Windows 8.1 starts but then asks for a key? I don't have a key as it should be in my bios. Now I am trapped using a trail version of 8.1 Enterprise until I can get the USB from Dell to work. Any ideas? I am desperate.
Thank you!
Gregg
