.NET Framework is a very powerful Windows platform extension created by Microsoft. It allows programmers to create fast, secure and portable applications. Actually all VASoftOnline.org software uses .NET Framework, that is why you have to install its last version on your computer. .NET is always available for free download from official Microsoft web site (microsoft.com). You can download .NET Framework 4 (the last .NET release) here. Once you installed it, all VASoftOnline products will work on your computer, as well as other software that depends on .NET Framework.
Quick facts about .NET:

• .NET Framework 3.0 is included in Windows Vista installation by default.
• .NET-depended software examples include AutoCAD, SQL Server 2008, Internet Information Server 7 and more.
• You can run .NET software on both 32-bit and 64-bit computer.

Usually it is trivial to install .NET Framework. However, you are always welcome to contact support if you will have any problems with it.