Receiving error 0x80070420 while windows updating

Two days before as I started my pc the orange shield appeared indicating that automatic update was ready. I clicked the shield and updates installed. Last day I did not receive any automatic update and so I tried to install manually. Each step seemed quite long enough and finally a message appeared indicating Error 0x80070420. I went through the steps again and again but in vain and now I am pointless that why I am receiving this message.
Can anyone please give me some solution?
