While I try to initiate or launch a Creative Suite 4 that is CS4 or Creative Suite 5 that is CS5 function, I obtain the error "Licensing for this product has expired", "The serial number you make use of to activate this product has terminated” or "unacceptable serial number. The serial number shows to be unacceptable". This can take place later than the application has already been running effectively for a few time, or while you start it for the primary time. So what I do and how can I solve this problem? Please suggest some ideas.