Joy, I think it's time you rang the HP service help line, they won't bite I promise! While the other's are giving you very good advise on how to look after your battery life, they are not getting the error message you are getting, so far everything you have tried has not cleared the message.
It maybe HP have had several calls on this very same error and know how to fix the problem, they will talk you through the steps on how to clear the problem if it is software related.
You have a 2 year warranty for hardware issues BUT free software help/support is only 3 months.
If you bought it in a shop, you could take it back there and get them to sort it out for you. (please remember not to have anything personal/photos/statements/banking apps etc on the laptop though)
(P.S. I used to work for HP as a technical engineer on their helpline but not laptops and technology has moved on a long way since I left there)
