Adware:Adware (or spyware) is a small program that is designed to show advertisements (in various form and degrees of intrusiveness) on your computer. It often reports personal information back to its owners. As a result your sense of privacy can be violated.
Vanish is an adware application that shows commercial advertisements and changes default start and search pages to predefined addresses. It also contacts certain web server, downloads and installs suspicious third-party software. Consider using good anti-malware application in order to get rid of this threat.