Errors after posting article

After having some troubles installing wordpress in the first place -which I fixed after a hint from here, by deleting and reuploading some files in the wp folder- I can now make posts and update my layout.

My posts are also visible, so thats no problem, however if you click a post to open it the site crashes.

It gives this error:

Not Found
The requested URL /2008/11/06/everything-in-one-touch-samsung-omnia/ was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

I suppose I must’ve done something wrong again, so who can help me out this time. I would really like to get it all up and running properly 🙂

Thanks,