I have tried to install the latest zope 2.12.5 on windows 7 (64 bit). Ran the zope egg. Made a zope instance with mkzopeinstance. One needs to disable the user accounts settings (run command uac and set slider to null) otherwise the service will not install. Still after this Zope will not start: there is no PID file present. After starting the Zope process immediately dies. So what could be the cause? Henk This is the error message: The instance's SvcRun() method failed Traceback (most recent call last): File "C:\Python26\lib\site-packages\win32\lib\win32serviceutil.py", line 806, in SvcRun self.SvcDoRun() File "C:\Python26\lib\site-packages\zope2-2.12.5-py2.6-win-amd64.egg\nt_svcutils\service.py", line 115, in SvcDoRun self.stop(pid) File "C:\Python26\lib\site-packages\zope2-2.12.5-py2.6-win-amd64.egg\nt_svcutils\service.py", line 277, in stop open(self.getReg('pid_filename',keyname='PythonClass')).read() IOError: (2, 'No such file or directory', 'C:\\Users\\henk\\zope\\var\\Z2.pid') There is also a warning: Zope-2034764167 (Zope instance at C:\Users\henk\zope): Process terminated with exit code 1. Traceback (most recent call last): File "C:\Python26\Scripts\runzope-script.py", line 8, in <module> load_entry_point('Zope2==2.12.5', 'console_scripts', 'runzope')() File "C:\Python26\lib\site-packages\zope2-2.12.5-py2.6-win-amd64.egg\Zope2\Startup\run.py", line 21, in run starter.prepare() File "C:\Python26\lib\site-packages\zope2-2.12.5-py2.6-win-amd64.egg\Zope2\Startup\__init__.py", line 75, in prepare self.setupSecurityOptions() File "C:\Python26\lib\site-packages\zope2-2.12.5-py2.6-win-amd64.egg\Zope2\Startup\__init__.py", line 144, in setupSecurityOptions import AccessControl File "C:\Python26\lib\site-packages\zope2-2.12.5-py2.6-win-amd64.egg\AccessControl\__init__.py", line 16, in <module> from AccessControl.Implementation import setImplementation File "C:\Python26\lib\site-packages\zope2-2.12.5-py2.6-win-amd64.egg\AccessControl\Implementation.py", line 98, in <module> setImplementation("C") File "C:\Python26\lib\site-packages\zope2-2.12.5-py2.6-win-amd64.egg\AccessControl\Implementation.py", line 51, in setImplementation from AccessControl import ImplC as impl File "C:\Python26\lib\site-packages\zope2-2.12.5-py2.6-win-amd64.egg\AccessControl\ImplC.py", line 17, in <module> from AccessControl.cAccessControl import rolesForPermissionOn ImportError: DLL load failed: is not a valid Win32 application