Internet Explorer 11 broke my PC

I don't usually use IE, except for doing my taxes, because it is incredibly slow. Fortunately IE11 doesn't work on Windows Vista, or I would be wasting a lot of time reinstalling everything again. But my FRAGG PC gets used for all kinds of miscellaneous tasks, such as developing web sites, playing music or audio books, and so on. Until Wednesday.
That was when the Windows Update facility broke my PC by installing an "important" update: IE11. One of the important functions of a browser is to view web pages, yet IE11 has failed dismally in this task, for reasons I cannot fathom. It won't open a single online web page, not even the "What's New in Internet Explorer" page.
Perhaps IE11 doesn't run on Windows 7 Home Premium 32 bit with 4GB RAM. Perhaps there is some driver or legacy software that is causing an incompatibility. I don't know. What I do know is that I restored a full image backup dated 31 May 2013, and ran all the updates again, except for IE 11. Everything works fine. Until I install IE11. Then it breaks my Audible player, Visual Studio 2012 debug mode, and anything that needs a web site, like DropBox, Google Drive, Last.fm, etc.
If you haven't installed IE11 yet, make sure you have a complete system backup before you do. Like me, you may be needing one. I tried some suggestions at fixing the problem, but neither method worked.
Update Wednesday 20th: Penny's Acer computer runs Windows 7 Home Premium 64 bit, and when she shut her laptop down to take it to the shop, it tried for 3 hours to install IE11, and still had not shut down. She left for the shop without her laptop, and I eventually just switched it off. Fortunately the IE 10 installation was still intact, and I was able to hide the IE11 update option.
Penny has asked me to uninstall IE10 altogether, and we'll use Chrome, and Firefox where needed.