uninstallation

well my friend, this are 2 very good questions,

in order to kill a process here is a code snippet:

 //Namespaces needed
using System.Diagnostics;

public bool FindAndKillProcess(string name)
{
	//here we're going to get a list of all running processes on
	//the computer
	foreach (Process clsProcess in Process.GetProcesses()) {
		//now we're going to see if any of the running processes
		//match the currently running processes by using the StartsWith Method,
		//this prevents us from incluing the .EXE for the process we're looking for.
		//. Be sure to not
		//add the .exe to the name you provide, i.e: NOTEPAD,
		//not NOTEPAD.EXE or false is always returned even if
		//notepad is running
		if (clsProcess.ProcessName.StartsWith(name))
		{
			//since we found the proccess we now need to use the
			//Kill Method to kill the process. Remember, if you have
			//the process running more than once, say IE open 4
			//times the loop thr way it is now will close all 4,
			//if you want it to just close the first one it finds
			//then add a return; after the Kill
			clsProcess.Kill();
			//process killed, return true
			return true;
		}
	}
	//process not found, return false
	return false;
}

in order to uninstall a program you can either do that by msi like this :

 private void uninstallSoftware() 
{ 
    Process p = new Process(); 
    p.StartInfo.FileName = "msiexec.exe"; 
    p.StartInfo.Arguments = "/x \"C:\\Application.msi\"/qn"; 
    p.Start(); 
}

or by registry information, like this for

"Adobe Reader 7.0.8" :

 Microsoft.Win32.RegistryKey Fregistry =
                Microsoft.Win32.Registry.LocalMachine.OpenSubKey("SOFTWARE")
                .OpenSubKey("Microsoft").OpenSubKey("Windows").OpenSubKey("CurrentVersion")
                .OpenSubKey("Installer").OpenSubKey("UserData")
                .OpenSubKey("S-1-5-18").OpenSubKey("Products");
            string []Names = Fregistry.GetSubKeyNames() ;
            string uninstall = "";
            string ApplicationName = "Adobe Reader 7.0.8";
            for (int i = 0; i < Names.Length; i++)
            {
                Microsoft.Win32.RegistryKey FTemp = Fregistry.OpenSubKey(Names[i]).OpenSubKey("InstallProperties");
                if (FTemp.GetValue("DisplayName").ToString() == ApplicationName)
                {
                    object obj = FTemp.GetValue("UninstallString");
                    if (obj == null)
                        uninstall = "";
                    else
                        uninstall = obj.ToString();
                    i = Names.Length;
                }
            }

            System.Console.WriteLine(uninstall);
            System.Diagnostics.Process FProcess = new System.Diagnostics.Process();
            string temp = "/x{" + uninstall.Split("/".ToCharArray())[1].Split("I{".ToCharArray())[2];
            //replacing with /x with /i would cause another popup of the application uninstall
            FProcess.StartInfo.FileName = uninstall.Split("/".ToCharArray())[0];
            FProcess.StartInfo.Arguments = temp;
            FProcess.StartInfo.UseShellExecute = false;
            FProcess.Start();
            System.Console.Read();