環境: Windows XP, IE 8

regsvr32 mshtmled.dll
regsvr32 jscript.dll
regsvr32 /i mshtml.dll

==========================================

You might want to try and re-register some of the dll's that may have failed to register during the initial installation.

regsvr32 mshtmled.dll
regsvr32 jscript.dll
regsvr32 /i mshtml.dll

If you are still unable to type in a text box, you can always download IE and reinstall.