Yes. I have solved the problem.
My application was being updated in a directory:
C:\Users\Administrator\AppData\Roaming\Macromedia\Flash Player
\
www.macromedia.com\bin\digitaleditions1x5
But the file associated for every pdf file was the original one from
which I made the installation. It's total wrong thing done by Adobe
Inc.
Why don't they make a full version installer which will not be dealt
as the original program but that will install and configure everything
depending on the system and upgrade itself not using firefox slow
shockwave flush plugin!
I associated the download file with pdf extension which don't say to
upgrade(until next update is released) again.
Thanks everyone.