I am unable to start wamp, .pid file deleted from location wamp\bin\mysql\mysql5.5.8\data, because of which unable to connect phpmyadmin, it's showing 2002 error, Please guide about how to start wamp.
The .pid file is recreated each time MySQL starts.
Mine looks like wamp\bin\mysql\mysql5.5.8\data\MACHINE_NAME.pid
Deleting it should not cause MySQL to fail on restart, so there must be another problem. Look at the mysql error log and if that does not tell you anything useful, look at the Windows Event Viewer, MySQL writes to the event viewer even before it tries to open and use its error.log file. There may be something in there that tells you what the problem is.
You can go to the Control Panel of the system and then remove the wamp server after you choose a new wamp server.