'Omiga plus' is installed on my computer without my permission, and the instructions to get rid of it are not working. The program is somewhere hidden, and I will have to work hard to find and remove it.
If you want to remove the application you have mentioned, try using Revo Uninstaller. Even if it can't uninstall the application normally, it will force it to uninstall by wiping out all traces of its presence from the system.
After that, try running AdwCleaner to make sure that there are no leftover rogue registry keys or toolbars in your system.