Exporting WP – Error 6 (net::ERR_FILE_NOT_FOUND):

I need to export all my posts, comments etc. due to a hacker attack (this seems to be the only way) but I am having trouble exporting it through the WP admin panel as all I get is an error message (it is translated below from swedish)

The webpage cannot be found
There is no webpage on the webadress: http://ohangie.se/wp-admin/export.php?download=true&content=all&cat=0&post_author=0&post_start_date=0&post_end_date=0&post_status=0&page_author=0&page_start_date=0&page_end_date=0&page_status=0&submit=Ladda+ner+exportfil
Error 6 (net::ERR_FILE_NOT_FOUND): The file or catalog could not be found.

I have tried removing cache & coockies from my computer, I have even tried it on another computer and I have tried it in Internet explorer with the same results.

Any ideas on why and how to fix it?

The site is here