.NET 3.0 framework was released a couple of days ago. I downloaded it today and try to install it and ran into the following.
I tried it on another computer... basically the same messaging only differening by the drive letter. That drive happens to be my NAS... which I didn't choose but rather the install package choose when unpacking the files to a temporary location. Thinking this was not good... I detached my NAS and ran the install with no problem.
The other Required installs (.Net 3.0 SDK for example) allowed me to install with the NAS attached.