I am working with django 1.4. And this error appeared:
TemplateDoesNotExist at /admin/ admin/login.html
I tried to reinstall django, but i did
If you're getting a "TemplateDoesNotExist" error, that means you are referring to a template that does not exist. :) You should have a templates directory, and check to see if admin/login.html exists in that directory path.
This is the Django 1.4 template documentation. IMO the Django documentation is quite good compared to most stock documentation.
Also you should know that the admin interface is not really designed to be customized. The built-in admin interface has a login feature already built-in, if you create a superuser with the manage.py script. If you're trying to build your own template, you should do so separate from the admin interface, unless you disable/remove the built-in admin interface completely and design your own from scratch. Modifying built-in admin code is more trouble than it's worth in my opinion.