My WinXP laptop does the same thing! Now Flash doesn't work for any application at all, and I have full Administrator privileges...I've uninstalled & re-installed dozens of times, but same thing as above happens and get error message that it Failed To Register. Just great...
I had the same problem on my Mesh Windows 7 64 bit system. Solved by clicking on the link on the right hand side of this page and downloading, then running the correct version of the full program, 17.7 mb (rather than the stub install, 1.0 mb). see:- Re: how do i install flash player on a different computer that has no internet access
Can't find the link you refer to.
Have Shockwave Flash 13, trying to get 14.
Win 7 Pro (64b), Firefox 30.
All the download sources I've been able to find send me to the GUI which only downloads a 1mb stub.
Thank you all for the replies; I'm quite surprised that this post generated this many replies, thank you all so much!
My problems started when IE tried to update to FP 14.
I did get my issue fixed; I used the Flash Player Uninstaller (found here: http://download.macromedia.com/get/flashplayer/current/support/uninstall_flash_player.exe), then restarted my computer.
I went to the Flash Player Archives page (http://helpx.adobe.com/flash-player/kb/archived-flash-player-versions.html), and downloaded the ZIP file under "Release and Content Debugger archives" of the last known good-working version (for me it was 126.96.36.199, released 5/13/2014).
This ZIP file contains 2 different versions for IE, Firefox, and Mac; one folder contains the normal versions, which didn't work for me....I kept getting the same error messages and had to keep using the Uninstaller, then restart computer, etc...
BUT, in the "Debug" folder, with the debug versions of FP, I first installed the IE version (typically named "flash_player_ax_debug.exe" or something similar with the ax designator), this installed just fine and now everything works again! I then updated Firefox with the other debug version, and everything works fine again.
I don't know if this will work for any other problems, but it worked great for me after having similar issues as the OP. Hope this helps.