Hello everyone, First time poster, long time lurker. Anyway, I need help reverting my surface pro 3 back from windows 10 technical preview to windows 8.1. I tried the simple, "rollback" option in the settings, but it won't work for me. It states that the files it needs to rollback have been deleted. I haven't personally deleted any files from my computer, since installing the previews. My windows.old folder is still present and full. Is there any way to revert back? Thanks!