

If you are already using Windows 8.1: skip to the next step ( Analyse your "install.wim") In the end, the following method is what worked for me (Updated on 30/07/15): I also tried to re-create the Recovery Partition, as I had saved all of its files, but that didn't work either. Reinstall windows 8 by install.wim - Requests - reboot.pro I found various tips and tricks online, including: What I didn't know, however, was that my Product Key was only valid for my OEM version of Windows, and no other, therefore I was unable to use the key when attempting to install the Windows 8.1 edition that I had downloaded. When I realised that various things were not yet working in this beta build, such as Bluetooth, I decided to revert back to Windows 8.1 with a clean ISO downloaded using Microsoft's Media Creation Tool.

I recently installed Windows 10 Insider Preview on my Acer Aspire ES1-311 PC (which originally came with Windows 8.1 with Bing). So I thought I'd share my solution in case others run into the same problem. I hope this post isn't too redundant, but I've spent the last 3 days trying to restore my OEM version of Windows 8.1 with the "install.wim" file that I had saved (before deleting the recovery partition to save space), to no avail.
