Setup and deployment web service and c# application 2 errors

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C#

service

web

i am developing a windows application connected by web service to get some data from webservice using visual studio 2010 ultimate

i want to make setup to let the user install this software on his machine but i got this error when installing it on older version of this application but when i install it without having old version it did not get this error

error number 1: the following applications are using files which the installer must update. you can either close the applications and click "try again"

notice that i put his code in installerclass.cs

string processName = "**********";

Process[] processes = Process.GetProcessesByName(processName);



foreach (Process process in processes)
{
    // MessageBox.Show("aaa");
    process.Kill();

}

but it did not work


error 2: Error 1001: Could not find file "c:\mypath\myapp.InstallState"

i tried many solution and searched online many times to solve this problem but i can't help it.


please i need advise as soon as possible