Try the very first steps we suggested again.
Clear the update cache. Try again.
Restart the computer. Try again.
If no go, it might be because you have drivers lingering for the firewall or similar other security products.
My favorite way to examine drivers is using ESET's built in Sysinspector.
Its in the Tools section of the Home Menu
Once loaded you can click on drivers and see if you have any still existing from other third party vendors.
I will provide a screen shot momentarily.
https://www.mediafire.com/convkey/d546/ph5cgncc4gihgf76g.jpg