I have to correct you here DavidR.
Normally you are right, but she is using 2K, not XP and in 2K IE is not integrated.
Still Snowhite, it is very much recommended to update IE.
IE (just as many other applications) is using dll files.
These are (what you can call them) template files and can be used by different applications.
So if there is a update for IE that also has a update dll, this will mean that the dll is updated for ALL applications that are using it.
Easiest way to update windows (and other microsoft things) is to go to
http://update.microsoft.com and install the updates from there.
If you have ms-office installed go back to that site after you have updated windows and click on office-family in the top of that screen to update the office components also.