Quick Summary
The error code 0x800f0900 generally indicates that a Windows feature or update installation has failed. This can be due to various issues, ranging from corrupted system files to network connectivity problems.
Common Causes
- Corrupted System Files: Damaged or missing system files can prevent the installation of new features or updates.
- Windows Update Service Issues: Problems with the Windows Update service itself, such as the service not running or being misconfigured, can lead to installation failures.
- Network Connectivity Problems: An unreliable or unavailable network connection can interrupt the download and installation of necessary files.
- Insufficient Disk Space: Lack of sufficient free disk space on the system drive can prevent the successful installation of features or updates.
- Conflicting Software: Certain third-party software, especially antivirus programs, can interfere with the installation process.
Step-by-Step Fixes
Method 1: Run the System File Checker (SFC)
Step 1: Open Command Prompt as an administrator. Search for "cmd", right-click "Command Prompt", and select "Run as administrator".
Step 2: Type sfc /scannow and press Enter.
Step 3: Wait for the scan to complete. If any errors are found, follow the on-screen instructions to correct them.
Step 4: Restart your computer.
Method 2: Use the DISM Tool
Step 1: Open Command Prompt as an administrator, as described above.
Step 2: Type DISM /Online /Cleanup-Image /RestoreHealth and press Enter.
Step 3: Wait for the process to complete. This may take a while.
Step 4: Restart your computer.
Method 3: Restart the Windows Update Service
Step 1: Press Win + R, type services.msc, and press Enter.
Step 2: Locate the "Windows Update" service.
Step 3: Right-click the service and select "Restart". If the service is not running, select "Start".
Step 4: If restarting doesn't work, right click, choose 'Properties', go to the 'Recovery' tab and set 'First failure', 'Second Failure', and 'Subsequent failures' to 'Restart the Service'.
Method 4: Check Disk Space
Step 1: Open File Explorer and check the amount of free space on your C: drive (or the drive where Windows is installed).
Step 2: If disk space is low (less than 10 GB), free up space by deleting unnecessary files or uninstalling programs.
Method 5: Temporarily Disable Antivirus Software
Step 1: Temporarily disable your antivirus software.
Step 2: Attempt to install the feature or update again.
Step 3: Once the installation is complete, re-enable your antivirus software.
Method 6: Check .NET Framework installation
Step 1: Open "Turn Windows features on or off".
Step 2: Ensure that the .NET Framework 3.5 (includes .NET 2.0 and 3.0) and .NET Framework 4.8 Advanced Services (or the latest version) are both checked.
Step 3: If not, check the boxes and restart your computer and try installing the Windows feature again.