How can I install .NET framework 3.5 on XP machines without internet connection?

"If you are using a localized version of Windows the setup automatically tries to download the language pack for your location.

To bypass the automatic download you can specify English as the installation language by using the following command line:

C:\path\to\installer\dotnetfx35.exe /lang:ENU

After the setup is complete you can download and install the language pack for your location manually.

Links:

Microsoft .NET Framework 3.5 Service Pack 1 (Full Package) (contains English language only)
Microsoft .NET Framework 3.5 SP1 Language Pack (use the ""Change Language"" dropdown on the page to select your language)"

"Have a look in your machine's Application and System event logs for any warnings or errors around the time when you were running the install, pay particular attention to any events logged by MsiInstaller.

It's quite likely that at least one of the messages should say what it's trying to install, which is very likely to be a missing pre-requisite of some kind (although you've got the full installer for .Net it probably doesn't include all the pre-reqs but assumes that you'll already have them, and then helpfully tries to download and install them if not).

See How .NET Framework 3.5 setup checks for its prerequisites behind the scenes for details on what the installer's doing to install it's pre-reqs.

The following are the prerequisites for deploying the .NET Framework 3.5 on Windows XP:

Windows XP Service Pack 2 (SP2)*.
Internet Explorer 6.0 Service Pack 1 (SP1)*.
Windows Installer 3.1*.
.NET Framework 2.0 Service Pack 1 (SP1).
.NET Framework 3.0 Service Pack 1 (SP1).
Windows Imaging Component*.
XML Paper Specification (XPS) Shared Components Pack 1.0*.
Software Rasterizer for the Microsoft DirectX 9.0 Software Development Kit (SDK).

(from .NET Framework 3.5 Deployment Guide for Administrators)"