Error Code 0x80070091: Causes & Solutions

Error code 0x80070091 is a common Windows error that indicates a problem with the system's ability to access or update files. This can manifest in various ways, from failed software installations to issues with the Windows Update process. Understanding the root cause of this error is crucial for effectively resolving it.

What is the Problem?

Error code 0x80070091 typically points to a corrupted system file or insufficient permissions preventing access to necessary files. This corruption can stem from various factors, including incomplete installations, malware infections, or hardware malfunctions.

What Causes It?

Several factors can contribute to error code 0x80070091:

  • Corrupted system files
  • Insufficient disk space
  • Malware infection
  • Incorrect permissions settings
  • Hardware issues (e.g., failing hard drive)

Which Operating Systems are Affected?

This error is primarily observed in Windows operating systems, including Windows 7, Windows 8, Windows 10, and Windows 11.

What Programs Often Get This Error?

Error code 0x80070091 can occur during the installation or update of various programs, particularly those requiring significant system access.

Common culprits include:

  • Windows Updates
  • Antivirus software
  • Game installations

How to Solve Errors

There are several methods you can try to resolve error code 0x80070091:

Run the System File Checker

Open Command Prompt as an administrator and run the following command:

sfc /scannow

Check Disk Space

Ensure that you have sufficient free space on your hard drive. Delete unnecessary files or programs to free up space if needed.

Scan for Malware

Run a full system scan using reputable antivirus software (e.g., Windows Defender) to check for and remove any malicious programs.

Run the DISM Tool

Open Command Prompt as an administrator and run the following commands:

DISM /Online /Cleanup-Image /RestoreHealth DISM /Online /Cleanup-Image /ScanHealth

Reset Windows Update Components

Open Command Prompt as an administrator and run the following commands sequentially, pressing Enter after each one:

  • net stop wuauserv
  • net stop cryptSvc
  • net stop bits
  • net stop msiserver
  • ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
  • ren C:\Windows\System32\catroot2 Catroot2.old

After running these commands, restart the services in reverse order using:

  • net start wuauserv
  • net start cryptSvc
  • net start bits
  • net start msiserver

Perform a System Restore

Use System Restore to revert your system to a previous state when it was functioning correctly.

Reinstall Windows

As a last resort, consider reinstalling Windows if the error persists despite trying other solutions. Download the latest version of Windows from Microsoft.

Remember to back up your important data before reinstalling Windows.

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