Did all my Windows updates including the latest Defender Definition before installing N360.
For some reason Windows is trying to install the Defender update again and of course since Defender is disabled, the update is failing.
Here is the tutorial with some effective ways to fix this issue on Windows 8 and update Windows Defender right away.
Windows Defender is the default AV pre-installed in Windows 8.
I spent quite a bit of time comparing a working machine running Build (10240) to this one Build (10586) of Windows 10.
Windows 10 Defender appears to only be partially disabled during the install of Norton 360.
After doing some research, I find that this error code is related to Windows Defender, which is locked out by Norton Security. I would like a simple solution, but a more complex solution such as editing the registry or running the command prompt as an administrator do not concern me.
For various PC problems, we recommend to use this tool.Whilst it was reported that Norton was installed I did not know if this would cause problems.I uninstalled Norton then returned to the Security Settings and turned off WD before reinstalling Norton. Additionally Windows 10 installs with Fast Start-up enabled which can cause Norton and other programs difficulties, it is suggested that Fast Start-up is turned off.The Windows Defender Services are disabled by stopping them and setting them to Manual but key Windows registry entries appear to be missing. When I update Windows Defender Definitions its goes loads a few times and says: Virus and spyware definitions: Connection Failed. Here are some troubleshooting steps to resolve this issue on Windows 8 and update Windows Defender successfully. Click on the Install Updates button to install updates. When on hitting the update button the Defender fails to update. At time updating defender from helps updating the defender. System corrupted files can also cause this issue, so run scan using sfc scanner.