Sweetpacks bundle can be removed from the classical Add/Remove programs. The point is that other items need to be removed manually. You will need to delete the required add-ons and set the default search engines to their default state. It's very easy as browsers nowadays provide simple ways to do that. It's in the settings menus. If you need additional info how to remove a specific feature, I recommend taking removal steps mentioned on the developer's page.
Make sure you uninstall the Sweetpacks Update Manager from the Add/Remove Programs.
