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WHEN I TRY TO INSTALL FLASH PLAYER ON WIN. XP SP2 I GET AN ERROR CERTIFICATE AUTHENTIFICATION FAILED
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Where are you downloading Flash Player from? and which version?
Could you go to http://get.adobe.com/flashplayer/otherversions/ and download a Flash Player 11 for your computer, and let us know if you still face the same problem.
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Moving this discussion to the Installing Flash Player forum.
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Try to download and run the installer from http://helpx.adobe.com/content/help/en/flash-player/kb/installation-problems-flash-player-windows.ht...
If that still fails, you may need to update your Windows XP to SP3.