Adobe Flash Player, version 10.1.102.64 installed, but I cannot access FP dependent applications

Adobe Flash Player, version 10.1.102.64 is installed, but I cannot access FP dependent applications (such as those on Facebook.)

I used the link you previously  provided  http://www.adobe.com/products/flashplayer/fp_distribution3.html

to  download the FP .exe and it worked for 2 days, but is no longer working and I'm getting the same message for both  Mozilla & IE. The only things I recall doing prior to FP not working again was 1) sign up for G Mail & 2) I used Save As to dwld a number of Images from Google.  I also rolled back my PC a day, but that has not fixed the issue.  I get the error both in IE & Mozilla.

I've reviewed HK Local Machine/Software/Adobe, but there is no file folder for Flash Player under HK  HKEY_LOCAL_MACHINE/Software/Adobe {though there are folders for Shockwave, etc.)  Does anyone know the KEYS for Flash  Player, that I could add manually?

System Information:

Win XP Home, SP 2

IE 8.0.6001.18702

Mozilla 3.6.12

Flash Player 10.1.102.64

Thanks for any & all help!

Sidney