thats probably the W7 UAC in operation.

starting with Vista, Windows does not like users installing files into the program folder.

depending on how you installed your PP2012, there might be a PP2012 runtime installed to your documents folder.

even if not, you should install your working runtimes outside the program folder.

how they are set up is a personal choice. i have over 50 distinct runtimes linked to my Poser apps.