Fix from Andy:

The code for generating the 
Zope service name doesn't lower case the names. Being windows this means 
c:\Zope and C:\Zope are the same files and hence valid instance homes.

However their hashes are different meaning you can't find the service 
name without knowing the exact case. 

skel/bin/zopeservice.py.in

@@ -99,7 +99,7 @@ sys.path.insert(0, SOFTWARE_HOME)
 
 from nt_svcutils.service import Service
 
-servicename = 'Zope_%s' % str(hash(INSTANCE_HOME))
+servicename = 'Zope_%s' % str(hash(INSTANCE_HOME.lower()))
 
 class InstanceService(Service):
     start_cmd = '"%s" "%s" -C "%s"' % (PYTHONW, ZOPE_RUN, CONFIG_FILE)