AceHTML 5 is far better than version 4.
I'd be more concerned with sorting out your Kernel32.dll error for now.
click here for some general information on Kernel32.dll errors. It also has lots of remedies, depending on the exact nature of the error.
If you get that sorted it will help the general running of your computer, as well as allow you to use AceHTML.
Some alternatives for you could include Arachnophilia or Porgrammers File Editor. If you go for Arachnophilia I suggest you look for version 4 which is still out there if you hunt about a bit. The current version if excellent but you need a very hefty Java download to go with it and becasue it's a Java application itself it is very memory hungry.
Arachnophilia 4 and Programmers File Editor are old favourites of mine and while they do not have all the nive features of AceHTML, they are still excellent web page editors with built in HTML tag functions as well as support for many other coding languages.