1 Answer

From their support site:

Internet Explorer users
Click the Start button and then select Settings > Control Panel > Add/Remove Programs.
In the list of programs, find the SwissConverter 2.1 toolbar, select it, and click Change/Remove.

Firefox users
In the Firefox browser menu, select Add-ons > Extensions.
Select the SwissConverter 2.1 Community Toolbar.
Click Remove.

Safari users
Open the Finder application and browse to Applications.
Scroll down to Toolbars and click on SwissConverter 2.1.
Double-click on “Uninstall”.
Fill in the “User name & Password” and click the OK button.

Chrome users
In the Google Chrome browser, go to chrome://extensions/.
Find SwissConverter 2.1 in the list.
Click Uninstall.

http://swissconverter21.ourtoolbar.com/help/ 

*For more assistance you can e-mail their techs here: http://swissconverter21.ourtoolbar.com/contact/