The uninstaller utility completely removes Avast if your having trouble with the default uninstall routine that comes with the program.

U.S. Robotics probably has call waiting commands you can add to the modem settings to disconnect your internet connection when online so you can receive a phone call. I used a utility program that came with my modem (Zoom) that worked really good. Robotics may also have a similar utility. Nevertheless, the modem command for my Zoom (when I used to use it) was AT$$CW1. I’m on wireless now but used a modem for several years.