OK so the updates for windows popped up on my compuer for a definition update for windows defender, so i install the update and it says the update has been installed and the yellow shield icon in the bottom goes away, about 30 seconds later it comes back and asks me to install the update again and it just keeps doing that every time. Does anyone know about this problem?

(Moderator edit: added topic description. jgweed)

Hello Harrybot

Try the suggestions recommended in MS Article ID: 915105

i got and error message when i ran windows defender that said "Application failed to initialize: 0x800106ba. A problem caused Windows Defender Service to stop. To start the service, restart your computer or search Help and Support on how to start a service manually."

There is some discussion about Application failed to initialize here and here.