I mistakenly downloaded an evaluation copy of windows 8 after reading all kind of assurances about the safety of doing so. The evaluation period is ended an now windows 8 is holding my computer hostage, shutting it down every 2 hours. I do not want windows 8. I want my windows 7 back. I have spoken to 3 Microsoft technicians (one of which offered to email me windows 7 so I could download it). Now I am referred to a forum with the now faint hope that my problem will be addressed. In simple terms please give me back my operating system and set my laptop free.