What method did you use to de-activate it?
I’m not sure, I just found out there are soooo many unknown authors.. and then saw a “disable wp-login.php” on the left toolbar so I clicked it..
Any chance that I can activate it on the server?
I got a plugin call theme-my-login, is this one?
I found solution here:
http://wordpress.org/support/topic/wp-loginphp-redirects-to-404-not-found?replies=13
1. in the “wp-content” colder change the name of the “plugins” folder to other name like “plugins.off”
2. now go to login page and it’s able to login
3. after login change back the folder name to “plugins”
4. go to lugin tab in dashboard and reactivate plugins except the one that might cause the login problem