Windows 7 64-bit Microsoft .NET Framework 3.5.1 is actually built into the operating system and usually does not require a standalone installer download How to Enable .NET 3.5.1 on Windows 7
You are trying to install a 32-bit package on 64-bit Windows 7, or vice versa. Solution: Ensure you have the x64 (64-bit) dedicated installer. If using DISM, the sxs folder contains both architectures. microsoft net framework 3.5 1 windows 7 64 bit download
: Click the Start button and select Control Panel . Windows 7 64-bit Microsoft
If you are struggling with because the PC is failing, consider this: Windows 10 and Windows 11 include native support for .NET 3.5.1 as a Windows Feature. You can enable it without any download (uses Windows Update or DISM). Open Control Panel : Click the Start button