Ok, there are two issue and they are both very easy to solve.

First is the lack of the addon folder. That means that you don't have the Poser Service Pack 3 (SR3) installed. Download it from Smith Micro and install it. Do not create the addons folder yourself, that is not the problem. The problem is that your Poser is lacking the whole SR3 installation.

Reality must be installed under the addons directory, that is not changeable. Your location is not working so you need to delete that Reality3 directory. BTW, once you will have the SR3 install you'll need to install Reality in a directory called Reality. That is simple because you just need to copy what is obtained from the zipfile. Just drag and drop.

Second, you must match the bitness of the application with the plugins. Although you have Windows 64-bit Poser 9 is a 32-bit application so you need to install the 32-bit version of Reality. That is one of the advantages of using the Poser Pro version, it brings 64-bit computing. Poser 9 is a 32-bit app.

Cheers.

Paolo

https://www.preta3d.com
FB: https://www.facebook.com/RealityPlugIn
Tw: @preta3d
G+: https://plus.google.com/106625816153304163119
The Reality Gallery: https://reality-plug-in.deviantart.com