Using Windows 8 – Windows Defender Update fails with error 0x80240022? How do I get my definitions to update?

Check the PC date and time – right click the clock in the tray and select adjust date and
time.

Verify and correct the month, day, year, and time. Reboot.

If this does not resolve it, contact our support agent at : http://www.microsoftliveassist.com/

You can manually download the (large file with engine and full definitions) latest definitions from the portal here: https://www.microsoft.com/security/portal/default.aspx

 need assistance(remote or live) to resolve the issue initiate the chat.live assist