.net – Microsoft .Net framework 3.5 SP1 Setup Fails

frameworksinstallationnet

On my Vista machine I cannot install the .Net framework 3.5 SP1. Setup ends few moments after ending the download of the required files, stating in the log that:

[08/26/08,09:46:11] Microsoft .NET Framework 2.0SP1 (CBS): [2] Error: Installation failed for component Microsoft .NET Framework 2.0SP1 (CBS). MSI returned error code 1
[08/26/08,09:46:13] WapUI: [2] DepCheck indicates Microsoft .NET Framework 2.0SP1 (CBS) is not installed.

First thing I did was trying to install 2.0 SP1, but this time setup states that the "product is not supported on Vista system". Uhm.

The real big problem is that this setup fails also when it is called by the Visual Studio 2008 SP1.

Now, I searched the net for this, but I'm not finding a real solution… Any idea / hint? Did anybody have problems during SP1 install?

Thanks