-download and install
-trie to start
-breaking up like described
-shut down ZA-firewall and windowsfirewall, which turns on automatically
-after reading forums, i tried to use start-up option "-nobenchmark"
-startet arma3.exe from installfolder in adminmode
-tried XP-compatibily
nothing happens, after the arma3.exe disappears in processes-window of the task manager. you can restart and after the first try, the loading takes a lot less time, till the process disappears.