Hello,
I am having a similar problem where I get an error during installation of version 5.5.00077 in Win 8.1 on a Toshiba Satellite I7 Notebook. I have disabled Noton, made new directories, even tried re-installing 2005, 2008,& 2012 .net stuff. None of this worked. Also tried a new download of ccstudio. The error dialog states Antiviris or corrupt download and to check the log file which I have attached.
Thanks,
Pat OConnor