Half White Screen

I am having yet more problems. I downloaded a couple of themes and they were not downloading properly, half the screen goes white and only a few of the links can be clicked, but even then it’s slow. I have to constantly reset safari in order to log in again.

Then I am having the same problem with updating plugins, plus my site is running slowly. My website is [NSFW] http://www.girlwithadirtymind.com [NSFW]. I have had the white screen three times before and deleted everything on my FTP site and reinstalled. This is ridiculous. I never had any problems like this on wordpress.com, plus does anyone know an easy to subscribe option by email without having to save a mailbox of names so that my subscribers get an email every time I post?

Thank you in advance to any genius who can help me.