Here is a step by step:
Uninstall and delete all the files that you have for Cabal.
If you still have a Cabal folder in your program files, just delete that.
Run CCleaner (http://download.cnet.com/ccleaner/?tag=mncol) on your registry to make sure no Cabal junk is left in there.
Update Windows completely. Keep going back to Windows update until it has no more updates for you.
Disable your firewall/virus protection and download the game.
When that is finished, right click the installer and run as administrator. Make sure your virus protection software is disabled.
If that does not work, you need to contact ESTsoft by sending a support ticket. If you are unable to log into the website, send an email to
[email protected]