Windows Defender is a solid anti-virus solution that comes free together with every consumer-based Windows SKU. Microsoft significantly improved the quality of its anti-virus software, and it is now considered one of the best in class. Still, it is not immune to weird bugs and issues. Once, it falsely marked Winaero Tweaker as malware and now fills up users' drives with tons of junk files.
From time to time, Windows Defender performs background checks to make sure your computer is running fine and healthy. The program then stores scan history in the
C:\ProgramData\Microsoft\Windows Defender\Scans\History\Store directory. Usually, that folder contains a bunch of files, taking only a few kilobytes. Unfortunately, that is not the case for some unlucky users. Some people report finding tens of thousands of temporary files. In some extreme cases, this number reaches five million, consuming more than 30GB of free space on a system drive.
There are already several threads on Microsoft Forums with upset users wanting to reclaim their storage. According to numerous reports, the bug affects different Windows Versions, including the most recent and older Windows Server SKUs.
Although Microsoft is yet to confirm the problem and provide an official workaround, users have already noticed that updating the Windows Defender's engine to version 18100.6 fixes the problem. If you cannot wait for the patch to come, you can manually remove all the junk. Just be aware that you need the Administrator access level to open the Windows Defender folder. Besides, Windows hides the ProgramData folder by default, so be sure to make hidden files visible before opening it. Bear in mind that that mysterious files may come back and you may need to repeat the cleaning process until Microsoft releases a patch. Monthly patches for Windows 10 are due to arrive on May 11, so make sure to install all the updates when they become available.
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