It crashes the computer - or just Poser?

This is likely the OpenGL problemm. I had that when I installed M4 after my year-long hiatus. Turned out I needed an nVidia-opdate.

Try switcing to SreeD for preview. If you can now open M4 without crashing, then it IS the OpenGL issue. Search for an update for your graphics card then :)

Hope it helps!

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.