Protection against phishing, malware, and other threats targeting email and collaboration tools in Microsoft 365
Dear @asmahan gbara
Thanks for the screenshot. The scan has already processed more than 466,000 files, so it may simply be taking longer than expected. If the file count stays unchanged for a long time, however, the scan may be stuck.
I’d first restart the PC and make sure Microsoft Defender’s security intelligence is up to date under Windows Security --› Virus & threat protection --› Protection updates. Also, please check that there is enough free disk space, especially on the system drive.
If the problem persists, try running a Microsoft Defender Offline scan from Scan options.
Microsoft also has a troubleshooting guide that covers this type of issue: https://support.microsoft.com/en-us/defender/troubleshoot-problems-with-detecting-and-removing-malware.