Ok here we go, its been a couple of years since I worked on a microtouch. In your com port settings check the buad rate it should be set to 9600 or 19200 also check to parity you should see something like this 0,8,n,1. Also check in your hardware settings to make sure that nothing else is conflicting with the com port (very important) this can be a little tricky but double check your modems properties. Go to 3m's site and download a program called microcal it is a DOS based program that will at least let you know that the hardware is running it will not work under windows so make sure that you start it from a DOS window. It has been my experience that the Microtouch serial adapters fail at a high rate due to heat problems. They may have fixed the problem but they did have good tech support. I hope that this helps you.