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winver — Windows version and OS build

Display the installed Windows version and OS build so update/KB guidance can be matched to the actual system.

Risk: LowReviewed: 2026-09-17
winver

When to use it

Use before diagnosing a cumulative-update or release-health issue when the Windows version/build is unknown. The same KB or known issue may apply only to specific releases/builds.

When not to use it

Winver is identification only; it does not check for updates or repair Windows. Do not assume a KB applies merely because the device runs Windows 11.

Primary reference

Reviewed source

Related authority records

Continue with the same failing system

These links share the same component or repair context; they are not generic keyword suggestions.

Error0x80070002 — Windows Update error 0x80070002: what it means and what to try first

Microsoft groups 0x80070002 among update install failures; preserve the context before using broader repair steps.

Error0x80073712 — Windows Update error 0x80073712: component store inconsistent

Microsoft maps 0x80073712 to ERROR_SXS_COMPONENT_STORE_CORRUPT in the Windows servicing context.

Error0x800F081F — Windows Update error 0x800F081F: repair source missing

In Microsoft’s servicing guidance, 0x800F081F maps to CBS_E_SOURCE_MISSING and calls for component-store repair or a valid matching source.

Error0x800F0831 — Windows Update error 0x800F0831: CBS store corruption

Microsoft classifies 0x800F0831 as CBS_E_STORE_CORRUPTION and directs troubleshooting toward component-store repair.

Windows updateKB5120998 — August 27, 2026 Windows 11 preview update

An optional preview cumulative update that later appeared in release-health history for desktop-background and mouse-personalization regressions on affected systems.

Windows updateKB5121003 — August 11, 2026 Windows 11 security update

The August 2026 security update for Windows 11 25H2 and 24H2. Release-health history links it to an ARM Teams/new Outlook launch issue, while a reported game-unresponsiveness cluster was later determined to be associated with RGB-related third-party drivers/components rather than Windows Update itself.