GS.Supporter is an adware program that injects advertisements like banners, inline text links and popups on your computer. These ads are aimed to install other suspicious content including web browser toolbars, optimization software and other such products. Once infected you can expect symptoms like random web text turned into hyperlinks, browser popups recommending fake updates and the installation of other adware programs without the knowledge of the user.
Most users end up uninstalling this program just within a few days.