Bandai Namco and From Software have acknowledged Dark Souls 2 is having issues on PC at launch. Subsequently, they have launched support pages for fans.
The issues are seriously bad. For some players, the game crashes as soon as they try to launch it. Some VAC banned players also find themselves unable to play, and some players cannot get their controllers to work or find their preorder bonuses. If you have these issues, you can look up workarounds here and here.