If you ever have a situation where Internet Explorer loads pages correctly, but you can't click on any text boxes and type into them, then it is likely one of the Windows DLL's has become de-registered. This is likely to be caused during software installs or potentially during the regular monthly software patching process we need to do to keep the system secure.
Good news is that there is a very simple fix!!!
Open a command prompt window (Start>Run>cmd) and type the following at the
prompt
regsvr32 mshtmled.dll
regsvr32 jscript.dll
regsvr32 /i mshtml.dll
You will receive a pop-up confirming as each of the DLL's are registered. Once you have finished, just re-open Internet Explorer (IE) and everything should be back to normal.
Hope this helps,
Aaron