davidholmberg on "admin blank white page probably due to url changes"

Hello,

I can't access my dashboard any longer, all is shown is a white blank screen. I've had similar problem before, and then the explanation was that I had messed it up by changing the address of the wordpress directory - without doing it with the right configurations. Then I could fix it by changing the directory of some files, and everything worked fine for a while.
I think the issue is exacly the same now. When I first started the page I used the directory:
http://davidholmberg.se/wordpress-3.3.1/wordpress/
then I changed to the directory:
http://davidholmberg.se/skrivarkiv/

My guess is that I can't access any of the pages in the admin because they are located at the "/wordpress-3.3.1/wordpress/" directory while it is set to search for them in the "/skrivarkiv" directory. (That explains it is only one plugin I can access right now and that plugin is installed in the "/skrivarkiv" directory.)

Is there any easy way I can fix this? I've got a new computer now and don't have access to the FTP client any longer. I've got access to the file manager at my webhost - but do not know what to change there. For example if I just copy all files in the "/wordpress-3.3.1/wordpress/" to the "/skrivarkiv" directory, would it work then?

David