Apache 403 Forbidden Error in server configuration

Hello everyone!
I had this Apache 403 Forbidden Error and it’s bad.
Since my server is not configured, I have made an attempt to solve it but failed. So I really need help.
If I create any directory http://www.myurl.com/?f =I faced Forbidden error.
If I Put any .php file http://www.myurl.com/?f.php =I faced Forbidden ERROR.
If I Put any .cgi file http://www.myurl.com/?f.cgi =I faced Forbidden ERROR.
The .html and htm files are fine. Even phpinfo.php files have corrupted with ERROR.
Can anyone help me?
Thanks in advance.
