Do you have sync software running for an iPOD, Cell/iPhone, Blackberry or camera on your computer? That is the number one thing to check when you start having problems with serial ports. Often the devices will have programs that monitor the comports for a connection from a device. In windows go to the Start menu, select run type
msconfig
in the box and press the enter key. Go to Startup section in msconfig to see a list of available programs that are run when you boot or login to your computer.
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