allora devi installare sia quello da 23 che quello da 108 MB (che è il kit SDK per lo sviluppo)...
ovvero cliccando qui:

Step 4: (Optional) Download .NET Framework SDK version 1.1
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This download includes all of the samples (quickstarts), documentation, and command line utilites. This is not the recommended installation package for production Web servers.
Unlike version 1.0 this does not include the .NET Framework redist. To obtain the 1.1 Redist you must download it separately from the link above.

Download .NET Framework SDK Now (108 MB)


tutto chiaro?