03-18-2015 12:33 AM
I don't know if ACT 2011 is compatible with Windows 8, so you might try to install ACT 2011 on a fresh, clean Windows 8 installation first, to see if it's working.
As your error message includes something with "Prereq" i guess there's a problem with the ACT prerequisites.
So you might try two things:
Potential prerequisites are