First suggestion is to a search in the forum for Dr. Geep. He has made some fantastic tuts on Poser, from the beginners to the more adavanced user. Second suggestion, when you are ready to install a new product, extract it to a dummy folder and double check the folder structure. Sometimes things are not where they should be, those you would have to correct. Again, refer to Dr. Geep's tut on folder structures for the version you are using.

I must remember to remember what it was I had to remember.