Pluck,
See if this page can help you.
http://windows.microsoft.com/en-US/w...sked-questions
Also, try this. When you click on the "enlarge" or "zoom" button, does a bar appear towards the top of your screen, it is typically yellow and says something like "this page is attempting to open another window..." If that bar appears, you should be able to click on it to display a list of options one of which will be "allow pop-ups from this site" or something along those lines. Then, go back and click "zoom" or "enlarge" again and it should work.
-Tim