I have a rather curious problem. First the hardware description. I use Sony VAIO E series laptop running Win7 Home edition. I was using a 3G USB dongle provided by MTS (a telecom company in India) for accessing internet. My laptop has 4 USB ports. I always used to insert this dongle in a particular port. A few days back I bought another dongle from Tata Docomo. I had to this because MTS had some legal issues and they stopped service in certain areas. This new dongle wouldn't work if I inserted it in the port where I used the old (MTS) dongle. It works fine in the other 3 ports. The error shown is 'No device found'. Other devices like USB drives work just fine. Can't seem to find a solution? Any help would be much appreciated.