For some reason Internet Explorer have hidden Javascript enable/disable behind lots of menus.
You need to click Tools\Internet Options ...
On the window that opens, click the Security tab
You'll probably find that the slider is set to High, or you have a Custom Level.
You can either click "Default Level" and choose "Medium High" or "Medium" depending on your version of IE, or if you must have a custom level:
Click Custom Level, scroll down to Scripting\Active Scripting (near the bottom) and ensure Enable is selected.
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