Can’t edit posts any more

Hi, hope someone can help.

I have a wordpress blog with the Revolution Pro theme. Version 2.6.1.
Anyway, the first 3 posts contain audio files (podcasts I uploaded into itunes), and when I went to add the podcast to the 4th one it wouldn’t let me.
Now I can’t access any of the posts. Keep getting an error message which says
“Internet Explorer cannot open the internet site “https://www.become-stylish.com/podcasthome/wp-admin/post.php?action=edit&post=8. Operation aborted”

Now I find this strange, because I’m trying to edit post 4, not 8.

I can’t even add a new post.

I can see that the files post.php and post-new.php are still on the server in the correct place, so it’s got me beat while all of a sudden I start getting these messages, when everything was working fine before.

Does anyone have any clues?

Annette