I replaced my motherboard, cpu & added a new hard drive and had to reinstall Windows XP, FS9 and pretty much everything else. I installed my PMDG 747 but while FS9 is trying to load the plane it crashes to my desktop.

What are your computer specs?Look at this, and see if it helps. http://ops.precisionmanuals.com/wiki/PMDG_...h_To_Desktop.29

Further FYI:How do I install the 737NG alongside the 747-400/400F?Due to an installer issue, the 737 should be installed FIRST, prior to installing the 747-400. You will not be able to run the 747 if you install the 737NG after it. Here's the proper install order: 737NG 600/700 Main Installer 737NG 600/700 Service Update 1.3 (if main installer is older than SU1.3) 737NG 800/900 Addon 737NG 800/900 Service Update 1 (if main installer is older than SU1) 737NG 600/700 Model Update (updates the models to 800/900 standards) 747-400 Main Installer 747-400 Service Update 1.1 (if main installer is older than SU1.1) 747-400F CARGO Main Installer 747-400F CARGO Service Update 1.01 (if main installer is older than SU1.01)