There's the "Advanced" -> "Output Debug Minidump" setting, that must be enabled.. You can also enable it from the login screen via "Advanced" -> "Debug Settings...", then by selecting SaveMiniDump and setting it to TRUE (then close and restart the viewer to make sure this setting will be saved).
Note that the viewer got a watchdog, under Windows, so you should let it close by itself when it freezes, else (i.e. if you remove it with the task manager) it will not core-dump either. The timeout is set via the MainloopTimeoutDefault setting, and the watch dog is enabled when WatchdogEnabled is TRUE.
If the watchdog doesn't trigger, then it's going to be really hard to diagnose... I'll need your settings_coolvlviewer_1264.xml file to try and reproduce this crash here, with your own settings...
You may also try to disable all the shaders (uncheck "Basic shaders") in the Graphics settings, and to disable the VBO usage in the Hardware Options, to see if it's a graphics driver-related crash. What was the last working release for you ? Also, I see you are still using v1.26.4 while your system is quite capable of running v1.26.8: is v1.26.8.4 working fine ?