Can't run on Windows 7 Home premium 64 bit

Hello,
when I try to start OpenERP GTK client on Windows 7 Home premium 64 bit, following error shows up:

Traceback (most recent call last):
  File "openerp-client.py", line 60, in <module>
  File "gtk\__init__.pyo", line 38, in <module>
  File "gobject\__init__.pyo", line 30, in <module>
  File "gobject\constants.pyo", line 22, in <module>
  File "gobject\_gobject.pyo", line 12, in <module>
  File "gobject\_gobject.pyo", line 10, in __load
ImportError: DLL load failed: The specified procedure could not be found.
Traceback (most recent call last):
  File "openerp-client.py", line 60, in <module>
  File "gtk\__init__.pyo", line 38, in <module>
  File "gobject\__init__.pyo", line 30, in <module>
  File "gobject\constants.pyo", line 22, in <module>
  File "gobject\_gobject.pyo", line 12, in <module>
  File "gobject\_gobject.pyo", line 10, in __load
ImportError: DLL load failed: The specified procedure could not be found.

The same happens with version 5 gtk client as well. Are 64 bit windows supported?