Not trying to be a jerk but if you'ye tech savy enough to create those images you should be able to manage installing W7 on something that cam with W8.

To clarify, W7 and W8 are the same core O/S, drivers are backwards/forwards compatible by design. If the driver software is refusing to install because it doesn't like the O/S version then simply extract the driver files to a folder, go to device manager and upgrade driver then have disk and point it to the folder.