The extra toolbars on your web browser are an example of bloatware. These sometimes come pre-installed on your PC or added by downloadable applications. Toolbars are the ones which appear at the top of your browser window usually below the address bar, and often provide their own search box. Toolbars can also be uninstalled by the same way as other software. Look out for toolbars when installing other programs and make sure you opt out by unchecking the tick box.