When I did that for Poser 7, I had to re-enter my Poser 6 serial number.  I didn't have it setup for Compatibility with XP either so I did as you suggested to "Run as administrator" and also selected compatibility mode for XP and it worked.  So I'm ot sure if it it needed both or just the administrator setting.

The only thing with setting compatibility mode for XP is that you get that annoying pop up window, but a small price for getting things to work.  I didn't try it in Poser 8 yet.  I'm only keeping Poser 7 on my computer since I don't know if Poser 8 files will work with Vue 7.

Poser 2, 3, 4, 5, 6, 7, 8, 9, 10, Pro 2014, 11, 11 Pro