Google Toolbar improves your Internet browser by adding some additional functions to it, including smarter searches, weather updates and some more. But if you don't use it anymore you should follow use the following instructions to remove it:
Internet Explorer users
The most effective way for complete uninstall of Remove Google Toolbar (or any other software) is to download and use CrystalIDEA Uninstall Tool.
Mozilla Firefox users
Click the Google icon in the right of the Google Toolbar and choose the Help option. Next is to choose Uninstall and follow the instructions.
Don't forget to quit all Internet Explorer and Firefox windows before toolbar removal.