This is weird
I have phpmyadmin 4.2.5 installed on my Windows 7 machine, it currently is working fine and located in localhost/phpmyadmin
I can view, edit, c
if by mistake you have changed the password of your default user('root') and now phpmyadmin is not even allowing you to open it than:
go to config.inc.php file
change your $cfg['Servers'][$i]['password'] = ' '
put ur password in ' ' that u changed.
C:\wamp\apps\phpmyadmin4.1.14 for config.inc.php