@Thanks4help The game freezing on alt-tab is a known issue. Never heard of it locking up the whole PC, though...
There is currently no fix for this, but people have managed o run the game in windowed mode to get around this, by launching the game with command line parameter "-win"
Note that Windowed mode only works if you set the game to run in 16 bit colour mode. Luckily, in Windows 10, this is simply among the exe file's compatibility options (whereas in older windows versions the only way to accomplish this was to actually reduce the colour mode of your desktop)
