A few things.. as previously mentioned NEVER install a newer Poser over and old version.

When you add runtimes you do NOT add the runtime folder itself.. you ass the folder it is actually IN. (In other words, you'll add your full "Poser 6" folder, and when you select that, you'll be in it's runtime.

Since you have a "fresh start" install all new content into some organised mmutliple runtime system. Don;t just drop everything into one folder.. you'll have crosstalk issues locating files, and it'll bog poser down to a crawl.

Way too many people take way too many things way too seriously.