Flash player refusing to work no matter what I do. Been going on for months now. Help?

Windows 7 (64 bit)
Chrome (32 bit) (ver. 27.0.1453.116 m)

Flash 11.7.700.225

It seems like, no matter what I do, Flash player will not work.  Keep in mind that I have already tried disabling/enabling both the plugin that comes with Chrome, along with the plugin that you can manually install from Adobe, and that alone doesn't solve my problem. 

If I try to play videos on Youtube, I get one of four results:

1) "This video is currently unavailable," which can come up if I have one of the plugins enabled.  I can sometimes solve this by disabling both plugins, but that only works about 25% of the time. 

2) The Youtube player just shows black and nothing else.  No audio/video and no indication that anything is playing.  Like with #1, this can also come up if I have a plugin enabled, and can sometimes be solved like in #1.  But again, this only works semi-occasionally.

3) I get the prompt to update my flash player.  This can come up if I have both plugins disabled, and I have yet to find a solution for it (yes, I've already uninstalled flash with Adobe's official uninstaller, and reinstalled it to confirm I have the most recent version).  If I enable any of the two plugins, I get an error message like in either #1 or #2. 

4) The video plays fine.  This only happens about 10% of the time, and is split half/half in terms of requiring the plugin on/off. 

So far, I have done the following in order to solve my flash problem, to no avail:

-disabled/enabled both plugins (mentioned above)

-uinstalled/reinstalled Flash Player using Adobe's official programs (mentioned above)

-tried using Firefox

-tried using the HTML5 player as an alternative (never works)

-disabled/reenabled every plugin one by one

-disabled/reenabled all extensions, and even tried browsing in Incognito Mode

-tried making an exception for Flash in Windows Firewall

-scanned for and cleaned up any viruses/malware/adware/spyware