Understanding the Error:

Error 0x80070005 indicates an access denied issue. Windows Update cannot access required files. Permission or corruption problems are typical causes.

Run as Administrator:

Run Windows Update from elevated Command Prompt. Right-click Start > Terminal (Admin). Run "sfc /scannow" first to repair system files.

Reset Windows Update Components:

Stop services: wuauserv, cryptSvc, bits, msiserver. Delete contents of SoftwareDistribution and catroot2 folders. Restart the services.

Take Ownership:

Run "takeown /f C:WindowsSystem32*.* /r /d y" as Administrator. Then "icacls C:WindowsSystem32*.* /grant administrators:F /t".

Clean Boot Update:

Perform a clean boot to disable third-party software. Search for msconfig, hide Microsoft services, disable all others. Try updating again.

Use Media Creation Tool:

Download Windows Media Creation Tool. Choose "Upgrade this PC now". This performs an in-place upgrade that fixes most issues.

Conclusion:

Resetting Update components solves this error for most users. The Media Creation Tool is effective for persistent problems.