Unfortunately, VS.NET is not a free download !
If you want to have Visual Studio 2002 or Visual Studio 2003, you need to purchase it. It is going to cost you around US$ 750 or more...
However, here is a good news. You can download trial versions of Visual Studio 2005 from Microsoft. Note that, this free download is a limited version. You have to download separate versiosn of C#, VB.NET etc.
Try this link to download Visual Studio - http://lab.msdn.microsoft.com/vs2005/