My f keys are also the volume and playback keys. It used to be that I could just hit the volume key to change volume, but now I have to hold the fn key to do so. Not a huge deal, just an inconvenience and I want it back to the way it was. I have tried getting to the startup menu by pressing I think F10 when I turn my computer on and I changed the F key function in there but it didn't change it at all. Tried googling it and asking someone I know who works with technology for a living, but with no fix.
I have a Toshiba L875 S7308 with windows 10 64-bit

Here's what my keyboard looks like:
Click image for larger version. 

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(IDK how to adjust size or whatever on pics...)