I broke my WAMP installation testing Facebook App locally. I could no longer get into PHP myAdmin.

I found the following link. The first advise is the one that worked for me.

http://stackoverflow.com/questions/10600795/wamp-server-error-forbidden-you-dont-have-permission-to-access-phpmyadmin-on

Go to C:\wamp\alias. Open the file phpmyadmin.conf and change

<Directory "c:/wamp/apps/phpmyadmin3.5.1/">
    Options Indexes FollowSymLinks MultiViews
    AllowOverride all
        Order Deny,Allow
    Deny from all
    Allow from 127.0.0.1
</Directory>

to

<Directory "c:/wamp/apps/phpmyadmin3.5.1/">
    Options Indexes FollowSymLinks MultiViews
    AllowOverride all
        Order Allow,Deny
    Allow from all
</Directory>