Sorry, I am running Win7 64-bit Nvidia GTX460 with latest drivers and no problems with any of the v2 releases.
I presume the error message is the standard MS eror message. If you are able to give me the details of the report (just the top few lines or attach the Appcompat.txt file written by Windows) I *might* be able to find out what has gone wrong.
I've a new PC with Win7 Pro and a Nvidia GTS450. All drivers are the last one. Now my 3DSimEd 2.15 didn't started.
All version 2.xx have the same probs, I get a message box:
"3dSimEd OpenGL Application didn't worked."
And now ?!
Only the 1.xx - version runs good.