I have DW8 and I got the same problem started two days ago. I have tried all solutions I ran across from this forum and others as well but NOTHING worked! (of course I avoided de-installing and re-installing the software from scratch).
Here is what i did and worked perfectly for me (and it makes sense):
I renamed (for the sake of recovery) the folder "translators" and run the setup of DW8 and selected "fix" instead of "remove". The installer took a bit of extra time checking the validity of all installed components. Once the setup finised, DW8 worked with no problems.
Aparently, the "x.htm" files in the "translators" folder got corrupted. "Fix installation" forced the installer to recreate the "translators" folder and all of its contents.
At any rate, it worked for me and I hope it does for most of you!
Happy Dreamweav-ing! and Seasons Greetings to all.....Ahmad