When installed, Microsoft .NET Framework creates a folder in [WINDOWS FOLDER]\Microsoft.NET\Framework\vx.y where x.y stands for the currently installed version of the framework (there can be more than one.) Otherwise, there is also a registry key that you can look for : HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework. You can also have a look at this page from CodeProject : http://www.codeproject.com/dotnet/DetectDotNet.asp Hope this helps! Simon

What do you mean by the OK button is not active ? Web Service creates a service, there is no user interface or OK button associated with it. Please be more specific. Simon