I have the following configuration:
Windows 7 Enterprise, 64 bit, SP1
i72820 QM CPU @ 2.30 GHz
8GB RAM
HP Elitebook
I have 4 versions of Revit installed on my system, Revit Arch 2012, 2013, 2014, 2015. Tried the install with nothing running, then again with Revit 2014 running, same result.