Microsoft has rolled out a fix for a recent update that has been causing the Windows Defender built-in antivirus software to crash on Windows 10 PCs when running a full system scan.
Per BleepingComputer, running a Quick Scan didn’t produce any error messages, but a Full Scan resulted in a failure when scanning files and multiple error messages due to an issue affecting the Windows Defender Antivirus service.
SEE: 20 pro tips to make Windows 10 work the way you want (free PDF)
Users on Reddit discovered Windows Defender was crashing when it reached filenames with two dots (..) in it. Simply removing one of the dots would allow Windows Defender to continue scanning.
Fortunately, a few hours ago Microsoft released a new Security Intelligence Update for Windows Defender that addresses the two-dot crashes. Since Microsoft automatically issues updates to Windows Defender outside its Patch Tuesday schedule, users should have received it and no longer experience the crashes.
If users are currently experiencing Windows Defender crashes, they can manually grab the latest updates by clicking ‘Check for updates’ within the Windows Security app.
Windows Defender users also ran into problems with Microsoft’s built-in antivirus in September, though in that case both Quick Scan and Full Scan were complete within seconds because Windows Defender wasn’t actually scanning files.