install plone error "Error Value: stat() argument 1 must be"

I am a new to plone.Following the installation instruction,I
tried
serveral times to install plone on my winxp sp2 box ,but
failed.
One time with python2.3.5+zope2.8.6+plone2.1.2,and the other
with
python2.4.3+zope2.9.3+plone2.5 beta2.
ZMI worked well,but when useing ZMI to add a plone site,it
meet the
following error:
Site Error
An error was encountered while publishing this resource. 
Error Type: TypeError
Error Value: stat() argument 1 must be (encoded string
without NULL bytes), not str

Is there a problem with my winxp's configuration?
What can I do to fix this?
Thanks.

Jack

Here is the postinstall.log
2006-05-27T13:53:35 ERROR Zope.SiteErrorLog http://localhost:8080/manage_addProduct/CMFPlone/ad
dPloneSite
Traceback (innermost last):
  Module ZPublisher.Publish, line 115, in publish
  Module ZPublisher.mapply, line 88, in mapply
  Module ZPublisher.Publish, line 41, in call_object
  Module Products.CMFPlone.factory, line 44, in addPloneSite
  Module Products.GenericSetup.tool, line 248, in
runAllImportSteps
   - __traceback_info__: profile-CMFPlone:plone
  Module Products.GenericSetup.tool, line 716, in
_doRunImportStep
   - __traceback_info__: plone_various
  Module Products.CMFPlone.setuphandlers, line 196, in
importVarious
  Module Products.CMFPlone.setuphandlers, line 25, in
installProducts
  Module Products.CMFQuickInstallerTool.QuickInstallerTool,
line 322, in installProduct
   - __traceback_info__: ('Archetypes',)
  Module Products.ExternalMethod.ExternalMethod, line 225,
in __call__
   - __traceback_info__: ((<PloneSite at /plone>,),
{}, (None, 1))
  Module
C:\Zope-Instance\Products\Archetypes\Extensions\Install
.py, line 15, in install
  Module Products.Archetypes.Extensions.utils, line 449, in
setupArchetypes
  Module Products.Archetypes.Extensions.utils, line 51, in
install_dependencies
  Module Products.CMFQuickInstallerTool.QuickInstallerTool,
line 322, in installProduct
   - __traceback_info__: ('MimetypesRegistry',)
  Module Products.ExternalMethod.ExternalMethod, line 225,
in __call__
   - __traceback_info__: ((<PloneSite at /plone>,),
{}, None)
  Module
C:\Zope-Instance\Products\MimetypesRegistry\Extensions\
Install.py, line 24, in install
  Module Products.CMFCore.utils, line 631, in manage_addTool
  Module Products.MimetypesRegistry.MimeTypesRegistry, line
102, in __init__
  Module Products.MimetypesRegistry.mime_types, line 13, in
initialize
  Module Products.MimetypesRegistry.mime_types.py_mimetypes,
line 72, in initialize
  Module Products.MimetypesRegistry.MimeTypeItem, line 32,
in __init__
  Module Products.MimetypesRegistry.MimeTypeItem, line 108,
in guess_icon_path
  Module ntpath, line 256, in exists
TypeError: stat() argument 1 must be (encoded string without
NULL bytes), not str



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