Unfortunately, we didn't faced this before. After some research it seems that this is a generic system issue. Here's the vs2010 pro installation failure
thread which debates a similar issue.
You can try the same approach, as there and use the Process Monitor
tool which can capture the access log.
Filter on the process name setup.exe in the log so that you see only the related list.
This should give you more info on what are the registry keys/ files being accessed when the hang happens.
Also, you should take a look on the “Windows event viewer” log where you might see why the installation process is hanging.