Crashes on startup in Windows XP

[Stephen G]

The Vista beautification code causes a crash on Windows XP.

Culprit code is:
  if os.name == "nt":
   self.setAttribute(QtCore.Qt.WA_NoSystemBackground, True)
   from ctypes import windll, c_int, byref
                 windll.dwmapi.DwmExtendFrameIntoClientArea(c_int(self.winId()), byref(c_int(-1)))

[Stephen G (stephen.g)]

The original check is too simple, it needs to be windows vista or 7. Can fix this using data from:
import platform
platform.system()
platform.version()
platform.release()

http://docs.python.org/library/platform.html

[Stephen G (stephen.g)]

fixed in alpha.4