I have Windows 10 operating system on HP Notebook laptop. I have installed Kali Linux on another partition and both the operating systems work fine (I am able to use both of them).Whenever I turn on the laptop, I am directly taken to Windows 10 and not given an option for Kali Linux. To boot into Kali Linux I have to each time press F9 to show boot options then i have to choose kali.
My problem is: i want to delete dual boot (kali Linux) but i am confused that does the GRUB is installed or not. To delete kali, deleting kali partition is enough or is something more i have to do.. plz help i don't know much... learner... any help is appriciated... thanks in advancee...
My very best advice to anyone running Windows 8 or 10 is to get a USB flash drive and make a System Recovery Drive (16GB might be big enough, but 32GB USB drives are cheap enough to be on the safe side). If your hard drive fails at any time and you have to replace it, the System Recovery Drive will boot your computer and reinstall Windows and all of the HP programs that came with it. It will NOT save programs you have installed yourself... other tools are needed if you want to do that.
Besides restoring your hard drive, you can boot on this System Recovery Drive and use it for diagnostics or repairs. This is what could be important to your current issue. If you delete the Kali partition and have a problem, you may need a System Recovery Drive to restore your Windows bootloader. If you have a DVD drive, you can also create a System Repair Disc that will let you restore the bootload, but this will not restore the Windows operating system. See more info about these Windows tools
here.
With all of that said, because of the way that you describe how your computer is booting... I think, I think but I am not certain, that you can delete the Kali partition from Windows Disk Management (and you can delete a SWAP partition too, if Kali created one). I think you will be okay... but I strongly recommend that you create one (or both) of the Windows tools that I just mentioned in case things go badly. You should also be sure to save any important data files to a USB or DVD in case things go really badly.
@captain-sensible's comments are accurate for older systems running MBR/BIOS, but your Windows 10 system is almost certainly a GPT/UEFI system. I think this is what will let you delete the Kali partition... because it is never trying to boot Kali and goes straight to Windows. If you were using MBR, you would definitely kill the bootloader by deleting Kali and would need a Recovery or Repair disk to restore the Windows bootloader. And if my guesswork is wrong, you may still need the Recovery or Repair to restore the Windows bootloader. Don't take a chance... make a Recovery or Repair Disk and keep it in your computer toolbox.
Good luck!