Current bug does prevent installation of all Python packages that are using
setuptools on Windows x64. 

I confirm that patch v2 is working (tested on Windows 7 x64) and we should
commit this to the trunk ASAP and also to current released version (0.6c9).

Also, I consider this issue critical because it does make the product unusable
for a big amount of users without any workarounds.

I do not have commit access, so we need help from somebody that does.

In addition we should release a new version to
http://pypi.python.org/pypi/setuptools that will include this patch.