I have updated to windows 8.1 there are virus and spyware protection updates available in notification area but every time during the update it stops and popup appears with the message. I have tried again and again but I am getting the same error. Do I need to install other antivirus program such as avast, but I want to stick with the same windows defender as it is a built-in product.

Refer to the attached image

Thanks for your help.