I also have another Python version on my system and i was wondering how could i "tell" Zope to use that one instead of the one it comes with from the installation executable package.

If you start up using the runzope.bat script in ZOPE_HOME/bin, just edit the value of PYTHON to point to the desired alternate executable. Don't automatically expect things to work smoothly on the first try - watch the output from startup and see if you need to pull missing dependencies into the sys.path (edit the value of PYTHONPATH if this is necessary) - or if the executable is even compatible at all (version, distribution/standard library, etc). Jim