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.
Fast Browser Search is an adware spyware that periodically contacts predetermined remote servers and shows unsolicited commercial advertisements. The threat is able to silently update itself via the Internet. Fast Browser Search is installed by a particular trojan without user knowledge and consent. It automatically runs on every Windows startup.
Technical details (How to remove Fast Browser Search(pop up))