You have:
WSGIScriptAlias / /C:/Users/Marcos/Documents/mysite/apache/django.wsgi
This is not true because RHS is not a valid Windows name. Using:
WSGIScriptAlias / C:/Users/Marcos/Documents/mysite/apache/django.wsgi
That is, there is no leading slash before the Windows drive qualifier.
Other than that, follow the documentation described by other mod_wsgi developers.
I edited the question from the poster to change what now seems like a typo in the message, and not a problem with its configuration.
If so, the following reasons for 403 are as follows.
Firstly, you also need:
<Directory C:/Users/Marcos/Documents/mysite/apache>
Order deny,allow
Allow from all
</Directory>
If you do not have this, then Apache does not get the right to service the script from this directory and therefore will return FORBIDDEN (403).
-, , , , WSGI script , Apache Windows.