Recently the .NET Framework 3.5 Language packages were released.

 You can get them by going to the following Microsoft Download center details page.

2.0 x86 --

2.0 x64 –

2.0 ia64 –

3.0 --

3.5 --


After you browse to the page then you will need to choose a language.  When you choose that language click download to attempt to download and install that language package.