
How to Fix Windows Update Error 0x80070020 on Windows 10 and 11
Windows Update error 0x80070020 is a file sharing violation that blocks updates from installing on Windows 10 and 11. Here's how to fix it, step by step.
Practical IT guides, comparisons, explainers and news — curated by practitioners.
Browse articles tagged Windows 10.

Windows Update error 0x80070020 is a file sharing violation that blocks updates from installing on Windows 10 and 11. Here's how to fix it, step by step.

Microsoft released KB5094127 on June 11, 2026, a security update for Windows 10 22H2 patching CVE-2026-0234 (kernel EoP), CVE-2026-0235 (RDP RCE), CVE-2026-0236 (graphics info disclosure), and CVE-2026-0237 (WebView2 bypass).

Microsoft released KB5087537 on May 12, 2026, a security update for Windows 10 1607 and Windows Server 2016 addressing kernel EoP, RDP RCE, GDI flaws, MSMQ RCE, and Print Spooler vulnerabilities. Build 14393.9140.

Windows 10 hit end of support on October 14, 2025. This guide walks through every ESU activation path: consumer enrollment, commercial MAK activation with slmgr, and Intune deployment, so your devices keep getting security updates.

Microsoft released KB5091573 on April 19, 2026, an out-of-band security update for Windows 10 Version 1809 patching CVE-2026-28301 through CVE-2026-28304. The vulnerabilities have been actively exploited in the wild.

Microsoft released KB5091572, an out-of-band security update for Windows 10 Version 1607 and Windows Server 2016, patching CVE-2026-0847 through CVE-2026-0850 and updating systems to Build 14393.9062.

Remove the Windows.old folder safely using Storage settings, Disk Cleanup, or PowerShell, and reclaim 10 to 30 GB of disk space after a Windows upgrade.

Microsoft released KB5075904 on March 11, 2026, the March Patch Tuesday cumulative update for Windows 10 and Windows 11. It patches 47 vulnerabilities including 8 critical CVEs, fixes Windows Hello errors, and improves network and memory performance.