Ever since 11.6.602.171 dl, flash is TOTALLY unlistenable

Question

static left & right channel dropouts tital sound dropout, ocasional jumpy video
windows XP SP3 4 core 4 GB mem 10000rpm western digital black disk
same thing with IE8,chrome,Firefox.
deleted files,cache,turned off hardware accel.boosted cache size etc etc
Please leave previous version installers up for download so one can back out.
it is not enough to just hace zip files of previous versions

Answer 1

When reporting issues with video or audio, it's also helpful to get your system hardware and driver details.  Instructions for finding this information can be found here:
Windows  
Sometimes video and audio problems are caused at a lower level and not directly related to Flash Player.  I recommend trying both of the links below to see how they perform.  If the problem exists with both, then Flash Player is most likely not the culprit as the HTML5 video link does not use Flash Player when playing.  You can verify the use of HTML5 by right clicking the HTML5 video and looking for the words "About HTML5" at the bottom of the context menu.
HTML5   video  
Non-HTML5 video
You'll want to try the HTML5 video with Chrome and Firefox, not with IE8.  What problem are you having with the zip files?  We do have the latest 10.3 release available (and it contains all the security updates):
Where can I find direct downloads of Flash Player 10.3 for Windows or Macintosh?