Answer. There could be a couple of reasons for this problem.

First, if you are using some sort of "Popup Blocker" software on your computer that could be interfering with the virtual classroom. Disable that software for a few minutes and then try starting the virtual classroom again. If this works, check to see if your Popup Blocker software permits you to specify a Web site as "OK" and add the virtual classroom to that list. If your Popup Blocker does not permit an "OK" list then you'll have to disable it every time you want to access the Virtual Classroom.

Second, the Virtual Classroom relies on a recent version of the Java Virtual Machine, which you can download for free from Sun Microsystems (http://java.com/en/index.jsp). You need to install that software on your computer before the Virtual Classroom will work.