My CM11A connects through COM1, and I had the same problem you have at first. Brian H, here on the forum, fixed my problem. Even though I'm running Windows XP, this "might" work for you also. Right-click on your ActiveHome desktop icon. Then click on the "compatibility" tab. Set it to run in compatibility mode for Windows 98/ME, disable visual themes, and turn off advance text services. Mine has been perfect ever since. Good luck.