Just bought the CRJ yesterday, version 1.01.  Turned off antivirus and installed on my system (Windows 7 Pro 64bit) to P3D v4 (which is pretty much a clean install).  I can select the aircraft when planning the flight, but as soon as I try to load the flight, P3D4 immediately crashes to desktop.  This only happens with the CRJ; flights load great with all other default aircraft.  Tried multiple liveries, both -700 and -900, uninstalling and reinstalling, with same effect, every single time.