OK it is as I suspected. UAC is active and you attempted to install content into program files.

The Poser installer very strongly suggested you not put your main runtime into Program Files. Yet you did. Now you know why it was strongly suggested not to do that.

Windows will not let 3rd party installers shove files into Program Files unless you jump through some hoops.

You have two choices. Start over and you will never have to think about UAC and the Virtual Store.

Or - start learning what you did, what Microsoft did, what Daz did, and how those three things are in violent disagreement.

The best solution is to install your main content in your documents folder, not your program files folder.

Further, 3rd party content really should not be jammed into your main runtime at all.  You will eventually be sad after you have upgraded Poser several times, and you are still carrying around your current main runtime, even though it will have been superceded by newer better ones in the future.

You'll be forced to keep it around because you jammed a bunch of stuff you did not get from SM into the place where you keep (and eventually throw away) what SM gave you.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)