Problem while clicking link(Win Forms)

Hi.. I have a problem while opening links in windows forms. I have one win form where there is a link to one website. When i click on that link it will open in IE7 browser. If i click n same link instead of showing same window which has opened its opening another window and it continues as per number of you clicking on that link. Please tell me what is the problem? and if you know C# code to avoid this plz let me know very soon. I have written code in that link like this: System.Diagnostics.Process.Start(Configurationsettings.Appsettings["LinkName"]);