Setup File

You should use threads.

Here is a simple code you need:

System.Diagnostics.ProcessStartInfo startNetInstall;
System.Diagnostics.ProcessStartInfo startAjaxInstall;
System.Diagnostics.ProcessStartInfo startAppInstall;
System.Diagnostics.Process pStart

if (CheckBoxNetInstall.Checked == true)
{
   startNetInstall = new System.Diagnostics.ProcessStartInfo("NetInstall.exe");
   startInfo.UseShellExecute = false;
   startInfo.RedirectStandardInput = true;
   startInfo.RedirectStandardOutput = true;           
   pStart  = new Process();
   pStart.StartInfo = startNetInstall;
   pStart.Start();
   pStart.WaitForExit();
   pStart.Close();
   pStart.Dispose();
}

if (CheckBoxAjaxInstall.Checked == true)
{
   startNetInstall = new System.Diagnostics.ProcessStartInfo("AjaxInstall.exe");
   startInfo.UseShellExecute = false;
   startInfo.RedirectStandardInput = true;
   startInfo.RedirectStandardOutput = true;           
   pStart  = new Process();
   pStart.StartInfo = startAjaxInstall;
   pStart.Start();
   pStart.WaitForExit();
   pStart.Close();
   pStart.Dispose();
}

if (CheckBoxAppInstall.Checked == true)
{
   startNetInstall = new System.Diagnostics.ProcessStartInfo("AppInstall.exe");
   startInfo.UseShellExecute = false;
   startInfo.RedirectStandardInput = true;
   startInfo.RedirectStandardOutput = true;           
   pStart  = new Process();
   pStart.StartInfo = startAppInstall;
   pStart.Start();
   pStart.WaitForExit();
   pStart.Close();
   pStart.Dispose();
}