Can't log in to Network after install

I found several posts like this one:
http://wordpress.org/support/topic/cant-login-after-installing-network-of-wordpress-blogs-with-subdirectory

and this one:
http://wordpress.org/support/topic/created-network-setup-now-cant-log-in?replies=4

I am having the similar problem. I cleared cookies and cached browser.
The difference is that I can log in to the primary site, but once logged in when I click Network Login on the top right of the dashboard and I add the username and password, it keeps looping me back to the log in. I keep changing the password, and try to log in and still no way to log in.
When I look at the primary, it says that to enable my themes, I have to log in to network and I can’t.:(