In my case, the problem was that the phpMyAdmin version was specified wrongly in the phpmyadmin.conf
file. You may check that:
Go to wamp/apps/phpmyadmin3.x.x: notice the file name - what version you are currently using?
Open file wamp/alias/phpmyadmin.conf:
Options Indexes FollowSymLinks MultiViews AllowOverride all Order Deny,Allow Allow from all
Check the first line (directory "c:/wamp/apps/phpmyadmin3.x.x/") is the file name exactly the same as your actual file name.
Make sure the directory file name is absolutely correct.