Windows 7 suddenly booting up on windows 10 PC

I've had windows 10 installed on my PC since it was released as a the free upgrade. The previous version of windows was windows 7 ultimate. Suddenly, my PC is booting up to what looks like an old version of windows 7. I've been able to get to a boot menu on startup and it only shows windows 7 as an option. Has anyone ever heard of this happening before?
Thank you
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  1. Best answer
    Ok I figured it out. The BIOS somehow reset itself and was booting from the wrong hard drive. Changing the default boot drive solved the problem.
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