Constant Guard is simply an installer for the Comcast security partners and includes a secure browser for the included online account security application. In essence, it is a dashboard application which allows the users to select the security applications they wish to install/enable. There is nothing wrong with the installer or application, and over a million xfinity customers are using it without complaint.
It IS a fultime web application which uses Microsoft .net, and so if your computer is older and is short on physical ram (1 gig or less) you will see a slow down as the web applications look to your hard drive for use as virtual memory - and if the drive is old, full, nearly full, corrupted, fragmented, etc. it will be slower yet. And a full, slow drive will crash regardless of whose application is in use. Run multiple fulltime web applications, such as multiple security applications at the same time in that environment, and your chances for a crash go up significantly. It is a matter of maintaining your drive, and having enough ram and a fast-enough processor for the applications you wish to use.
However, the previous poster is correct in that it is your choice. There is nothing wrong with Constant Guard, and once you install it, you have the option of installing Norton, but it is your choice as to whether you install both, either, or neither. As long as you are an xfinity customers, you can download it and install it when you wish. You can install it, remove it, and reinstall at a later date as well, if you wish.
