IEAK does have the advantage that it sets many of the needed registry edits for you automatically, and if you have a LAN set up, you can create a FLAT installation making setup extremely easy thoughout the library. You can install the IEAK version on each needed workstation over top of any existing IE setup. However, I'm not certain this step is even required. I would recommend using IEAK to create a secured version, however, that is a help sheet for another day. IEAK simply locked almost everything down, and I doubled my security by using some registry hacks.
Any registry editing is dangerous.
If possible, back up your registry files if you can. If you're uncomfortable with registry editing, I recommend researching the topic thoroughly before attempting any of the following changes. Each of these steps is just another security step to lock MSIE down. Keep track of any registry hacks you make, and any security precautions you create. This does not necessarily mean these hacks will be best for your library.