i just downloaded macromedia flash plugin for mozilla.
i just copied it to the plugins directory and run mozilla,
it didn't want to work at the very beginnig and i remembered to allow execution in the properties
after i re-run mozilla , it worked and browsed www.macromedia.com
to see it working and worked perfect !
the next day i run mozilla and took 10 sec to open !!
but it worked, and don't know what could have caused the problem, i wonder if anyone has come across this problem?