|Does it show in 'programs and features'? If so just uninstall it from there.|
Or it may be installed as an add-on:
"Click the menu icon "≡" at the top right of the browser window, choose "Tools" and choose "Extensions" to open a new "Options" tab.
Uncheck "Enabled" to disable an extension, or click "Remove" to delete it completely.
Click the "Disable" link under the plugin you want to disable."