In win7 there is a problem in using wamp and MySql at the same time due to using the same port no. 3306 by the both  wamp and MySql. So for resolving this problem change the port no. of MySql during installation (ex. 3307). Now you can use both at same time. If u want to use Mysql as DB in php then change the port no. in file “” .
For windows the directory of this file is “C:wampappsphpmyadmin2.11.5”

 In the image in second row give the new port no. of your DB.
I hope it can help u.!!