I see a mention of XP on your original post. I missed that before. There are some Windows XP systems that the online installer does not work on. The online installer team is investigating this. In the mean time, please use the offline installer posted at the bottom of the Installation problems | Flash Player | Windows page in the 'Still having problems' section.
Thank you very much for your help.Flash Player runs.After using the online installer accordance with the guidelines . Regards.