This is a virus detection. Viruses are programs that self-replicate recursively, meaning that infected systems spread the virus to other systems, which then propagate the virus further. While many viruses contain a destructive payload, it's quite common for viruses to do nothing more than spread from one system to another.
Indication of Infection
Existence of the NETWORK.VBS files, home page changed. Note that a normal Windows system will have a file called "c:\windows\wsh\samples\network.vbs" which is innocent and not related to this worm.
Methods of Infection
Running this file will directly install to the local machine and then it will begin scanning for available shares over the Internet.