Check the following:
1. You have the right com port - maybe have a look at your bios to see which one it is.
2. I'm not sure about this one but make sure the logger is set at the appropriate speed (hz/baud) - 9600 at a guess
3. Disable other software such as palm "hotsync", GPS logging software, Mobile phone "sync" software and anything else you can find that could remotely have anything to do with your serial port.
If all this fails try running 'msconfig' and doing a diagnostic startup.
Good luck,
John[/list]