WWindows RepairIntelligence™
Search
ToolsFavoritesHistoryLogin
Windows Repair Intelligence™ Report

0x80070643

A Windows Installer or update installation failed

Home / Error Codes / Installation / 0x80070643

The installation ended with a fatal error.

SeverityMediumSystemsWindows 10 / 11SymbolERROR_INSTALL_FAILUREUpdatedAug 31, 2026

Overview

This is a general installation result. Logs and the affected product are needed to identify the actual failing action.

Common causes

  • Damaged installer cache or package
  • Pending restart
  • Application-specific custom action failure
  • Windows component corruption

Symptoms

  • An MSI, application update, or Windows update rolls back
  • Installation history shows 0x80070643
  • Retry fails at the same stage

Prevention

  • Keep official installation media
  • Complete pending restarts
  • Do not manually delete the Windows Installer cache

0x80070643 diagnostic evidence

Official-definition grounded

Use the code identity and the affected operation together. The same numeric result can appear in different workflows, so logs and symptoms determine the safest repair branch.

Hexadecimal0X80070643
Unsigned decimal2147944003
SymbolERROR_INSTALL_FAILURE
Error familyInstallation
Severity bitFailure
Evidence sourceMicrosoft System Error Codes
1Confirm the operationAn MSI, application update, or Windows update rolls back
2Collect matching evidenceInstallation history shows 0x80070643
3Retest the same actionRetry fails at the same stage

Definition source: Microsoft System Error Codes. This report preserves the official code identity and does not claim one universal cause.

How to troubleshoot error 0x80070643

A fatal installation result does not identify the failing action by itself. The affected product and installer log are essential.

1

Identify the affected product

Open Windows Update history or Installed apps and record the exact product, package, and time of failure.

2

Restart, then use the official repair path

Restart Windows. Repair or reinstall the affected product with its official publisher installer or Microsoft’s installation troubleshooter.

3

Repair Windows components when applicable

If a Windows component or cumulative update is affected, run DISM and SFC, then retry and review the installer log if the same stage fails.

Before advanced repair: Do not manually delete the Windows Installer cache. Use the product’s official repair or removal package.

Official-source grounding

The error meaning is grounded in Microsoft System Error Codes. The visual sequence also follows Microsoft program installation troubleshooting and Microsoft DISM repair guidance. Causes and repair steps vary by system evidence; this report does not claim a universal success rate.

Frequently asked questions

What does 0x80070643 mean?

The installation ended with a fatal error. This is a general installation result. Logs and the affected product are needed to identify the actual failing action.

Is 0x80070643 always caused by the same problem?

No. The code identifies a failure condition, but the exact cause depends on the affected operation, Windows build, logs, and recent system changes.

Can Advanced System Repair help with 0x80070643?

Advanced System Repair can scan for damaged Windows components and related system issues. No tool can guarantee one universal fix; preserve backups and match repair steps to the evidence on the affected PC.