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.
Once the process is finished, launch Revo again and search for Snap Do. Initiate a new removal procedure to make sure it's deleted.
After that, try running AdwCleaner to make sure that there are no leftover rogue registry keys or toolbars in your system.