In the address bar (where you would normally type or see the website address), type in
At the top right of the screen there should be either
If it says the first, (+ Details), click on it (it will then show "- Details").
Scroll down the list of plug ins. You will probably have two, may be three entries for Flash.
One should have "AppData\Local\Google\Chrome\User Data\PepperFlash\" in the Location path. This is the Flash instance built into Chrome. At the left it will either say 'Disable' or 'Enable'. Click 'Disable' link to turn off this version and 'Enable' turn it on. When a plug-in is disabled it is shown with a gray background. Ensure that this version is Disabled.
Another Flash entry should have "AppData\Local\Google\Chrome\Application\" in the location path. This is the system Flash installation, the one that would also be used by IE, Firefox or other browser that you may have installed. Ensure that this is Disabled.
I also have a third entry, with "C:\Windows\SysWOW64\Macromed\Flash\NPSWF32.dll " in the Location line. It is showing a version number which is lower than both the Chrome and System versions, so I have it Disabled.
With this configuration I don't get the yellow 'Flash has crashed' notifications, but I do have to enable the Flash plug in when it's needed (on many sites). It's a pain, but at least I get to use the functionality that the Website intended.