Each release of the tool helps detect and remove current, prevalent malicious software. This malicious software includes viruses, worms, and Trojan horses. Microsoft uses several metrics to determine the prevalence of a malicious software family and the damage that can be associated with it.

Microsoft Defender Antivirus is a powerful tool that finds and removes malware from your PC. Here's how to use it in Windows 10 or 11 to scan your PC. Important: Before you use Microsoft Defender Offline, make sure to save any open files and close apps and programs. Open your Windows Security settings.

This article describes an issue that occurs when you print documents in Windows 8.1, Windows RT 8.1, Windows Server 2012 R2, Windows 7 Service Pack 1 (SP1), or Windows Server 2008 R2 SP1. A hotfix is available to resolve this issue. The hotfix has prerequisites.

This article describes an issue in which the iSCSI target service crashes randomly on a Windows Server 2012 R2 server. An update is available to fix this issue. Before you install this update, see the Prerequisites section.

Learn how to use the Gaming Services Repair Tool to troubleshoot installation and update issues with Gaming Services on PC.

Information that describes the removal of manifest expiry feature in AD RMS. An update is available for all Active Directory Rights Management Services (AD RMS) clients. This update prevents you from receiving error messages that are related to the application manifest expiry feature of the AD RMS clients.

Fixes an issue in which it takes longer than expected to collect performance data when you use Performance Monitor or a PDH function. Additionally, CPU usage is higher than expected while Performance Monitor or the PDH function collects the data.

Fixes an issue in which the NFS service freezes on a Windows Server 2012 cluster and a client computer can't access the NFS share.

Cause. This problem occurs because the SECURITY_DESCRIPTOR structure that is returned by the server contains a NULL Owner field when the NetShareGetInfo call returns to Windows Explorer. How to obtain this update.

This article describes an update that adds Microsoft Hyper-V integration components (integration services) to Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Server 2008 R2, or Windows Server 2008.