Some keys on keyboard are not working

Laptop: HP DM4 2070us
just recently, some of my keys are not responding or working when i press on them. I have not spilled or dropped my laptop but suddenly, my backspace, various numbers, and various f1 to f12 will not respond when i try to use them. it is very troublesome not being able to use my backspace bar and it is bugging me! i tried scanning my laptop for viruses but nothing was found. Im not sure if it could be a circuit problem or something but i need to fix it asap because i need my laptop for class. Please help me if anyone knows what may be the problem!!
Thank you! 

Hi
You have a couple of options as I see it please try these steps given below might help you to fix your issue.
1) Go to Device Manager and uninstall the click on + symbol next to Keyboard then uninstall the standard keyboard then restart your unit and check.
2) Go to HP website and update the Bios on the unit. 
3) Click start type Command Prompt check if all the numbers & alphabets works fine in this screen if not you might have to replace the keyboard.
If your notebook is still under warranty, contact HP and arrange to have the part replaced.
If you are out of warranty and would like a guide on replacing the part yourself, please let me know.
Let us know how it goes!
*Although I am an HP employee, I am speaking for myself and not for HP.
****Click the White Kudos star to say thanks****
****Please mark Accept As Solution if it solves your problem****
Regards
Manjunath
Let us know how it goes!
"I work for HP."
****Click the (purple thumbs up icon in the lower right corner of a post) to say thanks****
****Please mark Accept As Solution if it solves your problem****
Regards
Manjunath

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