Hi Casey,
When the sim crashes, do you get a error message? Look in the Windows Event Viewer for it.
Some things you could try are ... Delete the contents of your shader cache. Also, disable the saved flight scenario in your Prepar3d.cfg file*. That should cause you to start with the default plane and location, and will refresh your shader cache. Make sure you've got the latest drivers installed for your video card.
Let me know if any of that makes a difference.
*To disable your saved flight, look for a line in your Prepar3d.cfg file called "situation=" and delete all after the equal sign.
example > - SITUATION=C:\Users\Jeff\Documents\Prepar3D v3 Files\BWEP Pipeline Flight
changed to> - SITUATION=
Save the file and restart the sim. It should present you the
F-22 Raptor Cessna 182 at
some airfield on the east coast Friday Harbor as the default flight.
(edit- You're using FSX, aren't you. Should be the same, I think?!?)