[Zope] Zope service stopped

Hi, I have a problem. I'm running Zope on Windows 2K and one day it just didn't want to start. There is no info in zope or system log. It just dosn't start. I tried to install a new fresh Zope-2.7.4 installation, change ports it's running, reinstall a service. No change. Of course runzope.bat starts without a problem :] I found some info about the same problem, but not a clear answer. The only suggested solution was to check entry in registry. I did so. Everything seems to be fine. And I just found that:

PythonService.exe -debug Zope_myzopeservicenumber

works fine! Any ideas? Pawel Lewicki