I have problems too with Dune 2000 Gruntmods Edition 1.6.1.5 My system as Windows 8.1 x64bits - 1080p The game run well for a while. I start game, play as some house, but after about twenty minutes the game block completely, the only solutions is to do ctrl+alt+del and log out of windows or restart the computer, because I can't finish the process of Dune. Any one else have the same issue?