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Okay, i just found the solutions and i thought i should post it up if anyone else has the same problem.
symptoms: after you uninstall Appserv and you still seeing 'Apache' or 'MySql' running in your window's Services or when you restart your windows server it tells you one or more of your service didn't start correctly.
Possible error leads: Possible error might cause you not able to re-install Appserv or custom error in MySQL installation.
Solution(this only applies to Windows platform): open command prompt and type sc delete apache
Solution(this only applies to Windows platform): open command prompt and type sc delet mysql
Restart and your system should be ready for another installation of Appserv, mysql...ect