I got this question and my answer did not please the client. I installed Windows 8 and I don't like it. How can I uninstall it? There must be a way to do this because if the trial period times out and I don't buy it then it must revert back to Windows 7.
No. To go back to your previous version of Windows, you'll need to reinstall it from the recovery or installation media that came with your PC.
I think next time they will read the
faq before installing something as major as new OS.