Most popular Adobe Plugins: Flash, Shockwave, Adobe Reader http://www.adobe.com/downloads/
Testing your Flash+Shockwave http://www.adobe.com/shockwave/welcome/
Real Player http://www.real.com
Test your Real Player http://service.real.com/test/
Older versions http://forms.real.com/real/player/blackjack.html
Java http://www.java.com click on the link Do I have Java? to test your version