The .NET Framework (by Microsoft) is a runtime environment providing functionality for running applications which depend on this framework. See Wikipedia article .NET Framework for more information. There are several different versions of the .NET Framework:
It might be possible that an application asks for .NET Framework 3.5 (or a lower version) even if 4.0 is installed on your machine. In this case just install the required version. Several versions can coexist on one computer.
|