If you find a phpMyAdmin or 500 error solution

If you find a phpMyAdmin or 500 error solution Recently installed PHPMYADMIN4.0.8, always appear 500 errors, sometimes can log on sometimes can't login problem, encounter such a friend, you can first open the error Report of PHP, the screen should be the type of error code [function.require]: Failed to The main reason for this problem with open stream:no such file or directory is due to insufficient phpmyadmin permissions, such as your phpmyadmin under D:\WWW\PHPMYADMIN\, In addition to the phpMyAdmin folder to add IIS access permissions, you also add a user to the WWW file read and Write permissions, or there will be wrong, as to why so I do not understand now