Http://startscan.net/9/ can be classified as a browser hijacker that able to display thousands of advertisements on targeted computer without permission. It is created by tons of malicious codes from cyber hacker. Once it breaks into your computer successfully, your compute will be totally screwed up with those constantly pop-ups, advertisements, and other annoying things.
Basically, this Http://startscan.net/9/ usually bundled on a dubious program on an unsafe website that everyone are allowed to download and install into their computer. Once it breaks successfully, Http://startscan.net/9/ will start to change the settings of your computer to take control of your computer. It allows other infections to access into your computer and other malicious programs. With this thing in your computer, you just can not do regular online activities anymore. For example, when you try to view some information on your browser, those pop-ups will automatically shows up on your screen and cover those information what you really want to watch.