Adobe has released Shockwave Player 11.5.6.606 to patch a couple of critical vulnerabilities in earlier versions. It is recommended that users uninstall their current version (this can be done through Add/Remove Programs), restart the computer and then install the new version from here: http://get.adobe.com/shockwave/. Be sure to uncheck the bundled Norton Security Scan tag-along program install option before proceeding with the installation.
http://www.adobe.com/support/security/bulletins/apsb10-03.html