how can we install a newer version over the old version.Help Me Plz...

[Jeeva Mary Varghese]

Hi All, I am using InstallShield 12 for a deployment proces.But in that how can we install a newer version of a product over the old version of the same product.The problem is that ,my application having 2 different features.One Installation needs to Install the first feature and other needs to install the second one.But in this situation the previous one exists there in Desktop(shortcut)as well as files too when the installing the second one. Can any one plz help me to overcome this situation. Thanks In advance Jeeva