This .dll specifically allows applications to open. The only thing I can think of that is removing this is your anti-virus firewall during installation, as it tends to remove .dll's from specific games the anti-virus is unaware of. I'm not sure why, I just know from experience. This is just what happened to me when I tried to install Tigg's Impressive Title server a few years ago. I can only suggest right now is to uninstall Feral Heart and delete the Feral Heart folder in the location you installed it to in the first place (Local Disk (C:) if you stuck to the default destination). Then turn off your firewall for about 15 mins, long enough to re-install Feral Heart again. If it still continues, then I suggest doing some research on how to stop your anti-virus or firewall from doing this.
Just thought that I'd bring this up.
I saw you online a few minutes ago, so I assume you've got the problem solved?