The frequent "crashes" I remedied on my Win7 machine by uninstalling both Shockwave and Flash, and then reinstalling the Shockwave FULL installer, and then either the Flash Player for ActiveX (Internet Explorer) or Flash Player Plug-in (All other browsers)
As to the frequent stopping, you can set the amount of data Flash stores on your computer, (which increases the streaming cache) by right clicking ANY Flash video and choosing Settings or Global Settings. The only other things that could cause video freezes are insufficient Video RAM, or outdated video drivers, and if this PC was recently assembled, the driver are more than likely up to date.
A very strange thing has just happened. After several weeks of this problem existing after the new computer was assembled and just after posting my question here, yesterday; things have improved on their own. I did nothing to fix the situation, but now the videos are running almost normally. The bar that shows buffering does not show much buffered material beyond the point where the video is playing, but the pauses are now only every 5 or 10 minutes and they are shorter. I do not understand.
As for changing the Flash settings to allow more buffering, I can not find that option in either the settings or the global settings screens. Just where is it?
On the installation, I allowed the process to govern itself. When I first encountered a video that I wanted to play, I clicked on it and the installation screen poped up. I just said OK. I have done it this way before and it always worked. I wasn't even aware that Shockwave and Flash were different programs or that there were different ways of installing them. And I do not see Shockwave listed in the Programs and Features list of items that can be uninstalled.
The flash settings can be found in the control panel.