How to Remove 'istart123.com' from IE,Chrome,Firefox[Removal Guide]

Istart123.com can be classified into browser hijacker group and it attacks computer users’ browsers in a high frequency. Promoted by a third party or bundled with some certain files from the internet, Istart123.com hijacker can sneak into your system easily.
You can learn how to remove it manually in this video and also can learn to handle similar situations in this site:
http://www.removalvideos.com/
http://www.removalvideos.com/watch-video-to-drive-istart123-com-away-from-your-browser/