Make sure that your PC is connected to the Internet. Restart your computer and check if your Windows Defender’s behavior has improved. 
Navigate to this path: C:\Windows\Software Distribution. The next thing to do is boot into Safe Mode. Click OK to clean up the temporary files. Make sure that the box beside ‘Temporary files’ is checked. Select the System Partition (C:), then click OK. Here are the steps in removing the contents of the Definition folder and the temporary system files: It would also help if you delete the contents of this folder. It is worth noting that Windows Defender automatically and regularly updates its definition, storing the files in a dedicated folder. To get rid of this problem, it is advisable to remove all temporary files and restart the update procedure. In this case, it is possible that the previous version of Windows Defender virus definition has been affected. It is quite common to learn that certain system files associated with update storage and distribution have been corrupted. So, it is best to try our methods below to find which one will work for you. There are various ways to approach this issue. 
In this article, we will teach you how to fix Protection Definition Update Failed error code.
One of the common problems they’ve reported is an error accompanied by a message saying, ‘Protection definition update failed.’ It is worth noting that errors from the previous and current releases of Windows 10 continue to affect many users. However, it is undeniable that this program is still far from perfect. These days, more and more people are starting to consider Windows Defender as a reliable security tool.
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