Thank you for replying,
I appreciate your time, patience and efforts,
Considering, you are using windows 10 on your HP Laptop, the start tab is nothing but the button on the bottom left corner that gets you the start screen/programs - the same can be accessed using the windows buttons on your keypad between ALT and Fn keys.
Also about the links, I've edited and corrected them, please use the correct links, mentioned below to reinstall the latest updates for your Fn (Function) keys, please follow the below steps to fix this concern:
Click the Start button, then click Run .
2.In the Run window, next to Open , type MSCONFIG.
3.Press the ENTER key.
4.In the System Configuration Utility window, click the Startup tab.
5.On the Startup tab, under Startup Item , ensure that there is a check in the HKserv checkbox.
NOTE: If HKserv is missing, reinstall the HotKey Utility application by Clicking here
For windows 10 drivers: Click here
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Good Luck.