If you are experiencing issues with the archives, you may need to update your Java and Flash Player. Here are the links to get the latest versions:
To upgrade Java, navigate to the link below, then click "Begin Download". This will download the latest version and allow you to install it, then restart your browser: 
For Adobe Flash Player, please click on "Download Now" to download the latest version and then install it. Then restart your browser: http://get.adobe.com/flashplayer/
If the problem you originally had persists, you may want to try another browser such as Google Chrome. Go to http://google.com/chrome and click on download.