This is how I have the widget on my computer and it never gives me any problems.
Open up the software "Notepad"
Paste the embed code in Notepad
Save the file as... index.html (make sure to save it somewhere you prefer, like the desktop).
Most likely the icon will open up in your default internet browser, Internet Explorer. If you prefer FireFox..
right click on the icon you just saved.
Find your preferred internet browser (like FireFox). Then click "OK"