Whenever I switch off my Computer and turn it on again ( I usually leave it switched on ) I get a warning message box headed " Windows Defender". The message reads " Application failed to initialize Ox800106ba. 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." I click the cross in the top right to get rid of the message and everything continues as normal with no further problems.How can I stop the message appearing? I do have McAfee virus protection.