Stable/1.7.x "django-admin.py startproject mysite" command cause the "conhost.exe" exploding in the processing

About the "django-admin.py startproject mysite" command cause the "conhost.exe" exploding in the processing.

I build the environment according to the official document in homepage, everything go well. 

$ python -c "import django; print(django.get_version())"     output  1.7  

but when I use command "django-admin.py startproject mysite"

It didn't show nothing in the CMD and the CMD.exe keeping invoking the "conhost.exe" until the system break down.

Environment:
Window7 sp1 professianl
python 3.4
django 1.7