Why does this game and a few others I've played recently seem to be so short ? Are they not the actual whole versions ?

So I have had this issue with two Nancy Drew games now. The other 15 that I own have had no issues. But for some reason, this game and Nancy Drew: Secret of the Old Clock, while the game starts, only like the upper left quadrant of the game shows. Extending the screen does nothing. Changing the display resolution setting does nothing. Uninstalling and reinstalling does nothing. When I leave the window of the game, it begins to short loop the menu music and this error pops up: RestoreDirectDraw()-DD...

I bought this game in a pack a while ago but have just installed it today. Ran the game and a message came up straight away: CSound::LoadDIGISound() - channel 23 error, file C:\Program Files (x86)\Steam\steamapps\common\Nancy Drew The Creature of Kapu Cave\HDSound\Click01.his, CDirectSound() - Unable to create a Secondary DirectSound buffer, most recent HRESULT DirectSound func Return = DSERR_BUFFERLOST Does anyone know what this issue is/how to fix it?...

just bought and downloaded the game, after installing it shows this, anyone know what this means?

After the download finished I clicked on "Start Game" and then this warning appears http://abload.de/img/nancydrewqmkzw.png Can't play the demo like this :(