Greets.
I just so happen to have fixed my install, and maybe my advice can help others. (I had the same gameproject crash- return to desktop and can`t switch back to program error.)
I am using win7
Step by Step...
1) install game. c:\PanzerElite
2) extract patch 1.2-patchdat to root directory- c:\PanzerElite
3) extract seamless terrain files to root directory.
4) compatibility mode win98 on: 3d_control_center, mod_enabler, mymenu, gameproject, panzer_elite.
5) desktop to 16 bit.*
6) extract PanzerEliteThree, Scenarios2009PE3, Scenarios2010PE3 to root.
7) activate mods PE3 then scen2009 and lastly scen2010 with mod_enabler
8) en voila!
*) it seems that 32bit doesnt work, enable both desktop and game setting to 16 bit.
Good luck