Flash Player won't work

I was requested by the author of a video I was trying to view to upgrade my Flash Player.  I downloaded Flash Player 11 from the Adobe web site.  I uninstalled the old program.  Went back to the video I was trying to view and got another request to upgrade.  This program is not working.  I went to Adobe support and tried everything on the troubleshooting page more whan once. Still doesn't work.  What's wrong?  I am using an HP with Windows 7  AMD Phenom II x 4 820  2.80GHz  64 bit.  Additionally my pdf files in email don't work.