Safety Scanner - Remove Spyware, Malware, Viruses Free. Standalone System Sweeper Beta. Windows 7 Suddenly Won’t Boot – Reboot and Select Proper Boot Device or Insert Boot Media in Selected Boot Device and Press Any Key – Repairing the Windows 7 Bootloader « Russ' Do It Yourself Home Workshop. I had just walked away from my Windows 7 desktop after initiating a download of some VMWare software.
When I came back to it about an hour later I was presented by a boot screen that said, "Reboot and select proper boot device, or insert boot media in selected boot device and press any key. " This was all very interesting because I hadn’t done anything to reboot the computer. No power failures or anything like that had occurred.