Internal Server Error?

I am currently blogging using the blogger platform and I have been playing with the idea of switching to wordpress. I went ahead and bought whitspeaks.com and had wordpress installed directly onto whitspeaks.com.

It then occured to me that it would be a better use of the domain to have my blogger account ‘whitspeaks.com’ instead of using it as my secret test site. so on the settings page i switched the two url options to whitspeaks.com/wordpress … thinking that would free up whitspeaks.com and now everytime i go to whitspeaks.com/wordpress I get an error.

I have no idea what it was that I did wrong, how to get back to my dashboard… or what to do! please help!