warning.vbs is a malicious file, which belongs to MasterAntiVirus. It's a rogue anti-spyware, which is used for swindling people's money by making them believe that their computers are highly infected. Before you fall for this program and purchase its license for “fixing” your PC, you should check the system with reputable anti-spyware. We can guarantee that it will announce about MasterAntivirus and will offer you to remove this threat with all its components.
By the way, warning.vbs may also be related to various Internet worms, spyware or other malicious programs. When installed on the system, this file starts controlling these threats and affected OS. It may also try to control certain system's components, collect certain information and perform practically any task. This file contains instructions written in Visual Basic Script programming language that is powerful and very flexible. Most likely, warning.vbs will try to hide deep in system's background for avoiding its elimination. However, you can do that with a help of RegCure Pro.