Software⏱️ 3 min read📅 2026-06-19

How to Fix 0x8007005 Error – Cannot install SQL Server 2008 R2 express. Compiler returned error 0x8007005

Error installing SQL Server 2008 R2 express due to MOF Syntax error, access denied.

Quick Answer: Run the command prompt as administrator and try running mofcomp again.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. 🛠️ Step-by-Step Verified Fixes
  3. 💡 Conclusion

The error 'Compiler returned error 0x80070005' occurs when attempting to install SQL Server 2008 R2 Express, preventing the installation process from completing successfully. This issue affects users on multiple Windows operating systems, making it a frustrating experience for those trying to set up their database management system.

This problem is particularly vexing because it prevents users from accessing the full capabilities of SQL Server 2008 R2 Express, hindering their ability to efficiently manage and analyze data.

🛑 Root Causes of the Error

  • The primary reason for this error lies in the Win32 facility's inability to access certain system resources. This can be caused by a variety of factors, including insufficient administrative privileges or conflicts with other system applications.
  • Alternatively, it is also possible that there are issues with the MOF (Management Object Format) files used during the installation process, which may require manual intervention to resolve.

🛠️ Step-by-Step Verified Fixes

Resolving Access Denial Issues

  1. Step 1: Step 1: Ensure that the system has sufficient administrative privileges. Run the command prompt as an administrator and attempt to install SQL Server again.
  2. Step 2: Step 2: Check for any conflicts with other system applications that may be preventing access to required resources. Disable any unnecessary background processes or services before reinstalling SQL Server.
  3. Step 3: Step 3: If the issue persists, try running the Windows System File Checker (SFC) tool to identify and repair any corrupted system files that may be contributing to the problem.

Resolving MOF Syntax Errors

  1. Step 1: Step 1: Manually edit the MOF file using a text editor. Locate the line causing the error (item 10, lines 73-79 in sqlmgmproviderxpsp2up.mof) and remove or modify the offending code.
  2. Step 2: Step 2: If manual editing is not feasible, use the mofcomp tool to recompile the MOF file. This will update the MOF syntax errors and allow the installation process to continue.

💡 Conclusion

By following these steps, users should be able to resolve the 'Compiler returned error 0x80070005' issue when installing SQL Server 2008 R2 Express. Remember to ensure administrative privileges and check for conflicts with other system applications before attempting to install the software.

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