Means there is some problem in starting of server and it is not working correctly. Note: Sometimes the icon stops at Yellow colour or Red colour. Now start the wamp application and in taskbar a wamp logo icon will appear with Red colour, after some time it will turn Yellow(indicates that server is started but it is on offline mode) and then it will turn Green(indicates that server is started and in online mode).
Install the application on your system, by default it will install in ‘C’ partition under the path WampServer is available in 32-bit and 64-bit configurations. While downloading check for the latest versions or the versions of your specific need of Apache, MySQL and PHP and the bit system of server stack according to your system configurations.
WampServer is available for free (under GPML license). Go to WAMP Server Website and download the WampServer Stack.