Flash player 11.7.700.169 does not work on Firefox

Hello,

I updated the flash player to the latest version, but can't see any flash videos anymore (blank youtube links on Facebook e.g.). Before I uninstall it and get an older version of the player, I tryed to find an answer to this problems thanks to the threads on the website. Nothing helped.

I checked the version on my computer using http://helpx.adobe.com/flash-player/kb/find-version-flash-player.html, and:

   1. I can see the movie with the ball and the message "Flash Player is installed on your system"

   2. The box dynamically displays the following information:

          Your flash player version is 11.7.700.169

          Your OS: Windows XP (32-bit)

          Your browser: Mozilla Firefox

For info: Firefox 20.0.1 is installed.

I may not fulfill all the system requirements (but the player used to work until the latest version):

Microsoft XP Pro Version 2002 SP3

Intel Pentium M

processor 1,86 GHz Image may be NSFW.
Clik here to view.

1,00GB RAM

No windows update available.

In C:\WINDOWS\system32\Macromed\Flash are:

FlashInstall

flashplayer.xpt

FlashPlayerUpdateService

FlashUtil32_11_7_700_169_Plugin

genuinst

KB923789

mms.cfg

NPSWF32_11_7_700_169.dll

plugin.vch

Thanks for your help!