Select windowed mode, and a resolution greater than your desktop size (1680 would do here). Unless your graphics driver has some problems, the window will take up your full desktop size
Unfortunately for me, the maximum resolution I can select is 1600x1280. My desktop is at 1680x1050. Any chance for me?
I have also been using winSPWW2 on Mac (3 year old macbook) with Parallels for a year or so, and it works fine. It eats battery life, but I suppose most games do.
The only odd thing I can think of is that the splash screen at start is upside down. I play while within Parallels full screen mode (go to full screen before starting game).