For the Google toolbar spellchecker;

First you need to type in Google spellcheck in your search box


It will bring you to the Google spellcheck toolbar website


you click on the Download Google Toolbox


It will bring up another webpage, click the box that says you Agree and Install


A window box will then appear and you click on Install


It will tell you if it has been successfully installed and for you to restart your internet for it to be installed

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This is just a rough for now but it just shows you how to install it