23437 Windows calculator application

I want to offer my website visitors a free downloadable windows calculator application with a couple of special functions. The application should be installed so it's available from the system tray, from quick launch (optional) and from the desktop. The calculator should have at least regular basic functions and the special functions I need is like the product pricing calculations you see here: [login to view URL] The calculator should have a link to my website on the front. I will own all rights to the software and the source code.