A friend of mine downloaded Network Chemistry RogueScanner GUI in my computer and I don't need it. I tried to uninstall it but it is still in my Add and Remove Programs list.
Try using some uninstallers like Revo Uninstaller, Advanced Uninstaller PRO or IObit Uninstaller. All of them are easy to use and include a lot of useful features.
After that, try running AdwCleaner to make sure that there are no leftover rogue registry keys or toolbars in your system.