If you want to detect if your .NET Framework 3.5 installation was successful, you can use this tool to verify that the right versions are installed.
1. Download the following file to your computer: http://cid-e7f319723234fb5c.skydrive.live.com/self.aspx/Public/netfx35tools/NetFx35_detect_issues.bat
2. Open a command prompt by doing start -> run and type cmd.
3. enter the full path to where the script runs.
What is happening:
This script will check the registry for the right versions of the .NET Framework 3.5, .NET Framework 3.0 SP1 & .NET Framework 2.0 SP1. they are not there then it will return what it did find and let you know that an error happened.
Further on Vista, it will tell you if you have appropriately installed .NET Framework 2.0 SP1 & 3.0 SP1.
0 == Success
>0 == Failure