The most common reason for the "v 30319 error" is a corrupted installation that refuses to update. The best way to fix this is to perform a cleanup and a fresh install.
This is the latest version supported on Windows 7 (with Service Pack 1). Standalone Installer: If a web installation fails, download the .NET Framework 4.0 Standalone Installer .net framework 4.0 v 30319 error windows 7
If SFC finds corruptions but cannot fix them, download and run the for Windows 7 (KB947821). This tool replaces missing files and registry errors that affect .NET. The most common reason for the "v 30319
Create or edit app.config file in the application's directory: .net framework 4.0 v 30319 error windows 7