I have found that something becomes unfunctional in Poser, Carrara, Vue etc too.
Your problem may not be Poser specific.

Stuff you need to do first (stuff that doesn't involve money or removing and reinstalling etc.

-Have you
              -- clean out the garbage in your internet browser file and history folder
              -- wiped out unnecessary cookies-I just have four on my computer-rendo site is one of
                  them.
               -- used a good computer cleaner like Clean Sweep.  Gets rid of junk in your registery, 
                   temp, cache, etc. I clean mine several times a day 
               -- defragged your computer-I do mine once a week
               --  turned off your computer for about 10 seconds? 

Jan