When I use the launcher to run Legacy in any mode other than software mode, the screen immediately goes black and then I receive the message "signal handler () : segment violation", and I'm returned to the launcher. I can run it in software mode with no problems. I am using the original doom.wad and doom2.wad. Both have the same problem.
I'm using Legacy v1.42, Windows XP SP3, nVidia 9800 GT, 2GB RAM, with up-to-date graphics drivers. My monitor is a 24" widescreen. I have tried to fiddle with different resolution settings in the config.cfg file but this makes no difference.
I last played Legacy over a year ago, when I had a different graphics card, an nVidia 8800GTX with the same computer, which ran Legacy with no bugs at all.
I've included my error log. Thanks.