Can't download definitions. Error Code: 0x80240022

Please bear with me because I am new to forums... using Microsoft Security Essentials, I am unable to update the definitions.  Error message says, "MSE could not download definition updates.  This may be caused be a missing system file, an incorrect system setting, or a problem with a file registry."  I have been deleting files tonight and may have accidently caused this.  But, I have no idea how to begin to repair the problem.  Please help

Question Info

Last updated January 16, 2020 Views 26,127 Applies to:
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 that does not resolve it, please open a support case:

To open an email support case, start here:

You can manually download and install the full engine/definition update from here:


~ Microsoft MVP Windows Live ~ Windows Live OneCare| Live Mesh|MS Security Essentials Forums Moderator ~
Windows Insider MVP (Security), Moderator Microsoft Community

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