How to resolve error code 0x800F081F: .NET Framework installation error in Windows Vista

To resolve error code 0x800F081F during .NET Framework installation in Windows Vista, follow these steps:

1. Update Windows: Ensure your Windows Vista has the latest updates. Go to Start > Control Panel > Windows Update and check for updates. Install any available updates.
2. Use the .NET Framework Repair Tool: Microsoft offers a .NET Framework Repair Tool to address installation issues. Download and run the tool from the Microsoft website.
3. Manual .NET Framework installation: If previous steps fail, manually install the .NET Framework. Download the installation package from the Microsoft website and install it.
4. Disable antivirus software: Antivirus programs can sometimes block .NET Framework installation. Temporarily disable your antivirus software and retry the installation.
5. Perform a clean boot: A clean boot helps resolve software conflicts causing the error. Follow the steps in this Microsoft article to perform a clean boot.