I tried updating from IE9 to IE10 via windows update. When it started installing the whole thing stalled around 80% then nothing happened. So I left the computer alone for an hour, came back and nothing had changed. I couldn't close it or anything so I had to manually reboot. After that I can't install IE10 at all:
"Internet Explorer did not finish installing
Setup can't continue because a more recent version of Internet Explorer is installed on your computer"
Even after I downloaded the full 42MB IE10 install file from microsoft.com. I have checked the Programs & features - View installed updates list as suggested in a couple of help sites I've found online but there's not IE listed there at all. I'm using IE9 at the moment which seem unaffected except that the language has changed.
I got the 800706BE error code from windows update history.