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The error code 0x800F081F typically indicates that the source files required to install the .NET Framework 3.5 are missing. Here are some steps you can take to resolve this issue:
- Check the Source Path: Ensure that the path specified for the installation source is correct. The path should point to the
\sources\sxsfolder on your Windows installation media. - Use the Add Roles and Features Wizard:
- Insert the Windows installation media.
- Start the Add Roles and Features Wizard.
- On the Select features page, check the .NET Framework 3.5 Features box and click Next.
- On the Confirm installation selections page, click the Specify an alternate source path link.
- Enter the path to the
SxSfolder and click OK to proceed with the installation.
- Check Group Policy Settings: If your system is configured to not download files from Windows Update, you may need to adjust the Group Policy settings. Ensure that the Specify settings for optional component installation and component repair policy is enabled and that it allows downloading from Windows Update.
- Verify Access: Ensure that you have read access to the source files and that they are not corrupted or incomplete.
If these steps do not resolve the issue, consider using a different installation source or contacting your system administrator for further assistance.
