Ugh, game's doing this to me now, too. I upgraded from Vista to Windows 8 because the game doesn't give Vista users a mouse icon in fullscreen mode, & it's pretty much so laggy it's unplayable in windowed mode.

So now that I'm running Windows 8, the game just randomly freezes up my whole computer, gives me a black screen that I can't do anything with (can't alt-tab out, mouse icon won't move, can't do *anything*) so I need to turn my computer off, then back on again to get it useable.

VERY UNHAPPY WITH YOU, SE.