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167 articles covering known issues and general troubleshooting. Search by product or symptom to narrow the list.

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▦Microsoft Defender Antivirus on WindowsInvestigating

False “Microsoft Defender Antivirus Is Disabled” Notification

"Microsoft Defender Antivirus is turned off" notification appears when starting or using Windows

Windows 11 26H1/25H2/24H2/23H2, Windows 10 22H2/21H2/LTSC 2019/LTSC 2016, and Windows Server 2025/2022/2019/2016/2012 R2/2012 with the latest Defender updates
Checked 2026.09.05Read guide ↗
▤Desktop PC graphics card PCIe slotTroubleshooting guide

Graphics card runs at PCIe x8 or a lower generation: check GPU-Z Bus Interface, M.2 lane sharing and BIOS link speed

The GPU-Z "Bus Interface" field reads something like "PCIe x16 5.0 @ x8 5.0" or "PCIe x16 4.0 @ x16 2.0", with the value after @ lower than the value before it

Windows 11 / Windows 10 custom-built or desktop PCs where the GPU-Z "Bus Interface" field (including the GPU-Z page in ASUS GPU Tweak III) shows the graphics card running with fewer lanes or an older generation than expected, such as x8 or PCIe 2.0 / 3.0
Checked 2026.09.13Read guide ↗
◫Classic Outlook for WindowsResolved

Outlook 2024/2021 LTSC crashes when opening email from Viva Engage and similar services

Classic Outlook crashes when opening email sent by Viva Engage, Viva Insights, Yammer, Power Automate, or similar services

Known crash examples: Outlook 2024 LTSC 16.0.17932.20700 and 2021 LTSC 16.0.14334.20440. Check installation against the Office update history: the May 12, 2026 builds are 17932.20776 for LTSC 2024 and 14334.20670 for LTSC 2021.Event 1000
Checked 2026.09.12Read guide ↗