virtualenv under Win7: easy_install fails in virtual environments

Hi,
I've installed setuptools for my default python installation and it
works perfectly without even asking for admin credentials to install
packages.
After that I've installed virtualenv.
If I do:
>>> virtualenv x
... a new virtual environment is created, but whenever I try to run
easy_install within the new virtual environment, I'm prompted to enter
my admin password (I'm running as "Power User" normally) and
easy_install fails complaining that "Can't find D:/correct/path/to/
virtualenv/Scripts/python.exe". This path is private to my normal, non-
admin account.
It also fails if I'm running as an administrator and perform the same
steps.
I've tried runas to no avail too.
Is this a known issue?
Regards,
Guillermo
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