If you have clicked to register your computer, but it continues to ask you for the verification code each time you sign on, your computer may be set to delete out any information, like the registering of the computer, each time you exit your browser.  When MFCUatHome is saved to your computer, it is saved as a cookie.  Some browsers, as well as anti virus systems, are set to auto-delete any cookies it detects.  You may need to change the settings within your browser in order for it to remain saved on your computer