Installer does not start

Hey Girls and Guys,

i just downloaded the Game and tried to install it. The Problem is that the '‘Exe’ does not start. I already restarted the PC and shut down the firewall. It still does not work. Everytime i try to start the installer, it seems to load for a few seconds but nothing happens. I need help and dont want to waste 25 bugs for sth that doesnt work.

…oh and my OS is Windows Vista…