Try reinstalling Poser 6 on the new computer and then just link to your old runtimes.

I just got a new computer as well and though I didn't have any problems running Poser form the external (and thus moveable) harddisk I have for Poser, I still installed Poser 6 to get the fileasociations and whatnot right.

And THEN I linked to my trusty old Poser Pro Pack runtime LOL

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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.