The short version
- 01Confirm that 0x80070570 occurred in Windows Update and record the failed KB.
- 02Back up the OS disk before deeper troubleshooting.
- 03Have an administrator match WindowsUpdate.log and CBS.log to the failure.
- 04Use sfc /verifyonly to check system-file integrity without requesting repair.
- 05Follow Microsoft's update-download and servicing repair sequence for the identified cause.
- 06Use disk repair only with a backup and the appropriate administrator guidance.
Raw message
0x80070570
Likely causes
- Update files are corrupt, truncated or cannot be processed.
- Servicing corruption, disk errors or security-software interference affects the update.
Keep the Update package with the code
Microsoft's dedicated article concerns Windows Update on client, Server and Azure systems. It says update files cannot be read or processed, with damaged downloads, servicing corruption and disk errors among the causes. Our recommendation is to record the KB and failure time.
Verify before selecting a repair
Microsoft uses WindowsUpdate.log and CBS.log to identify the package and sfc /verifyonly to check integrity. Our recommendation is to have an administrator match the failure before choosing the article's download-cache, DISM or SFC repair branch.
Back up before disk or servicing changes
Microsoft requires an OS-disk backup before troubleshooting. Disk repair can be lengthy and require a restart. Follow the linked procedure with an administrator. Its Azure Run Command and repair-VM options apply to Azure VMs; they are not physical-PC instructions.
Sources and review notes
Checked on . Official documentation read October 6, 2026. Recording context and administrator-led branch selection are editorial guidance. This reference is scoped to Windows Update, not every file-copy error. Glitchary is independent of Microsoft.