htmlayout.dll error message on INSTALL of free avast version

I got a new windows 8.1 computer and am trying to install the free version of avast so I can then enter my key for the internet security version.

I see many posts that pertain to the htmlayout.dll not working …GUI…not continued…blah, blah…

They all relate to upgrading avast however I am trying to do a fresh install.

I have copied a new copy of the dll as there is not …avast software/…setup folder to copy it from nor one to paste it to. I have pasted the dll to system, system32 & syswow…whatever…

Same error message!

Totally frustrated and without security here…please can someone help me out!!!

Thanks

this forum section is for reporting virus and false positive problems … not install problems

is this a new machine?
did it come preinstalled with AV from factory?
General: Uninstalling a third-party antivirus software http://www.avast.com/en-gb/faq.php?article=AVKB11#artTitle