Install .NET 3.5 SP1 on Windows 7 RC

While attempting to install .NET 3.5 SP1 on a fresh install of Windows 7 RC, nothing happens. The machine gives a UAC prompt. When selecting Yes, nothing happens.

Using the full redistributable package gives the same result: nothing.

Is there a reason why the .NET 3.5 SP1 installer would suddenly quit and not proceed with installation?

I just tried the installer on Windows 7 RC to see what happend, and got the following message (which happens to have the solution to your problem :)

"You must use 'Turn Windows features on or off' in the Control Panel to install or configure Microsoft .NET Framework 3.5 SP1."

Sure enough, there it is. Enable it by clicking Start --> Control Panel --> Programs --> Turn Windows features on or off. It is a checkbox right in the middle.

I thought it was already included. Although, it would probably show a message. Try running it from the command prompt and pasting any output.