To tell you the truth - not the slightest idea!
You're on a Windows server it seems though and pixelpost haven't been tested on that.
It's hard to tell where it fails. Open up the mainscript, index.php, and near the top you will have a line that says error_reporting(0);
Change that into error_reporting(E_ALL);.
That will probably throw some errors your way which in turn we might be able to draw some conclusions from.
Cheers // pixel