Since Windows 7 comes with .NET 3.5.1 pre-installed but turned off, you simply need to activate it. This avoids download errors and security risks from third-party sites.
| Error | Cause | Fix |
|-------|-------|-----|
| 0x800F0906 | Cannot download files | Use DISM with Windows 7 installation media |
| 0x800F081F | Source files missing | Same as above — provide sources\sxs folder |
| Installation hangs | Windows Update issues | Stop Windows Update service temporarily |
| Already installed but apps fail | Corrupted .NET config | Run .NET Framework Repair Tool from Microsoft | microsoft net framework 3.5 1 windows 7 64 bit download
A: Yes, all editions of Windows 7 (Starter, Home Basic, Home Premium, Professional, Enterprise, Ultimate) in 64-bit support .NET Framework 3.5.1. Since Windows 7 comes with
A: Yes, but note that Windows 7 reached End of Life (EOL) in January 2020. While .NET 3.5.1 itself is stable, running it on an unpatched Windows 7 machine exposes you to security vulnerabilities. If possible, run it on Windows 10 or 11 (where .NET 3.5 is an optional feature). | Error | Cause | Fix | |-------|-------|-----|