Error 500 when goin to wp-admin (Wordpress) - wordpress

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at admin#example.com to inform them of the time this error occurred, and the actions you performed just before this error.
More information about this error may be available in the server error log.
Apache/2.4.9 (Win64) PHP/5.5.12 Server at localhost Port 80
As you can see, i can't get into my admin CP. localhost works fine, the trouble comes when i visit localhost/wp-admin. I was trying out this guide, but when it didn't work, i just deleted what i copy pasted. I'm on space bound, and hope here would be a good soul to help me out.
Regards.

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Please contact the server administrator, webmaster#domain.com and
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More information about this error may be available in the server error
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UPDATE
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