Scripting

I am new to Wise for Windows Installer and I have intergrated the product with Visual Studio.NET 2003. I am writing a COM Addin for Outlook and Word 2003 that will require the user to close the applications before installation. I have created an Installer class in C# that provides the following function:

public long CloseMSoffice()
{
// Get all instances of WinWord
// running on the local computer.
Process [] wordProcess = Process.GetProcessesByName("WinWord");
// Get all instances of WinWord
// running on the local computer.
Process [] outlookProcess = Process.GetProcessesByName("Outlook");
if (wordProcess.Length > 0)
{
return 1;
}
else if (outlookProcess.Length > 0)
{
return 1;
}
else
{
return 0;
}
}

How do I get the installation to display a message to the user if the applications are open (return value of 1) and then restart the installation?