function keys are secondary on newer windows 8 laptops that mainly use them for vol up/down etc by default
you have to hold the fn key between control and windows key and then press the f key you want
stuff sucks, but you can disable it on startup by accessing your bios and turning action mode keys off under system configuration
i dont think your laptop keyboard has a seperate f lock key; if this is it:

atleast i cant see one, but im p blind