Use this code, this is in c# as i work on c#. But will work the same way on VB.net.
Try and if u have any problem then tell me.
System.Diagnostics.ProcessStartInfo start = new System.Diagnostics.ProcessStartInfo();
start.FileName = "The full address of the new application to start";
System.Diagnostics.Process pro = new System.Diagnostics.Process();
start.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
pro.StartInfo = start;
pro.Start();