You must place a voice call to Dell support. Be prepared to verify your ownership details and since the system is likely out of warranty, have credit card handy - the call isn't free of charge outside of warranty.
In your response , I live in IRAN country and I don't think DELL has a tech support in this location and I don't have credit card .I have common card that use in my country if you can help me in other way please tell to me
DELL LATITUDE E6510
Serial number or service tag DKH7LN1-1F5A