Solutions I read may or may not fix problem but they will degrade your browsing experience, perhaps dramatically or perhaps dramatically later.
Try changing file association, search for file association with windows search tools, it is a control panel item.
Which program to associate with .SWF or in English, Flash? I prefer VLC, find this time using Google or Bing. Download VLC and install. Choose advanced installation (Do this with EVERY INSTALL) and read each screen carefully, the Dark Side is trying to get you install, umm, how do I say it, crap. Only install VLC and make sure you didn't inadvertently choose to download something other than VLC, again re carefully and don't just naively click accept. Once installed make .SWF file...