I have a Acer Aspire XC-703 desktop which came pre-installed with Windows 8.1.
Recently, it had started being very slow so I decided to carry out a complete Refresh. The process reached 3% and then failed - it just froze and the little circle stopped going round. Eventually I had to power it off.
Now, when I turn it on, it tries to Auto Repair, Diagnose the PC and then reboots - it doesn't get any further so the Windows installation has obviously been damaged.
I have an official Microsoft Windows 8.1 Full Version reinstallation disk - it didn't come with this PC but I assumed that wouldn't matter as the product key is meant to be embedded in the BIOS.
When I try to reinstall Windows, it asks for a Product Key - which of course I don't have.