[Zope] socket.error: (10048, 'winsock error')

[O.l.i.v.e.r T.h.u.n.s]

I tried to setup ZServer from the Zope-2.0.0a3-src.tgz archive. I
untarred only the Zserver and the lib/python/ZPublisher directory
(don't want to use Zope now, only ZPublisher). I get the following
error when I execute the start.py (renamed to zserver.py).

Any idea what could be wrong with my configuration?

D:\opt\zope>python zserver.py
log: adding channel <select-trigger (loopback) at 8409b0>
Traceback (innermost last):
  File "zserver.py", line 84, in ?
    from HTTPServer import zhttp_server, zhttp_handler
  File "ZServer\HTTPServer.py", line 115, in ?
    from HTTPResponse import make_response
  File "ZServer\HTTPResponse.py", line 97, in ?
    from PubCore.ZEvent import Wakeup
  File "PubCore\ZEvent.py", line 91, in ?
  File "ZServer\medusa\select_trigger.py", line 102, in __init__
    a.bind (self.address)
  File "<string>", line 1, in bind
socket.error: (10048, 'winsock error')