Several updates to necessary applications have been released in the past several days; here's a summary.
iTunes/QuickTime: Open iTunes and you may immediately be prompted to update to the current version of 9.0.2. Or you can click Help - Check for Updates, and follow the prompts to complete the update. If you're installing iTunes for the first time, be sure you get the correct version - 32-bit or 64-bit. The easiest way to do this is to go to Apple's web site and let it detect the proper version for you: http://www.apple.com/itunes/download/
RealPlayer: Open RealPlayer, click Tools - Check for updates and follow the prompts. Current version is RealPlayer SP 1.0.2
Shockwave: The easiest way to install the correct and current version of Shockwave is to go to the Adobe web site and click on the "Get Adobe Shockwave Player" link. Current version is 220.127.116.112
Java: If you have Java installed with automatic updates enabled, you'll be familiar with the prompts in your System Tray to update. Do it. Don't be afraid, and don't be lazy. If you'd like to install fresh, go to the Java Downloads page and let them tell you what version you need. Follow the prompts and be done with it. This is another application that comes in 32-bit and 64-bit. If you have a 64-bit OS, you need both versions of Java. Read this and follow the instructions: http://www.java.com/en/download/faq/java_win64bit.xml