Changed basic settings

I have changed the basic settings on my administration panel by
omitting /blog and now I lost my Theme and get all the information
like printed on my printer.
When I try to login my website, I get the message:
Not Found
The requested URL /wp-login.php was not found on this server.

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

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Apache/2.2.14 (Unix) mod_ssl/2.2.14 OpenSSL/0.9.8i DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 mod_jk/1.2.28 Server at perfectformulaonline.com Port 80