If you have a USB to Serial converter and have lost the driver CD this may be helpful.
Drivers Need for Serial Converters
This has happened to everyone at least once. You are using your laptop to configure some network gear and you can't get the serial adapter to work because you don't have the drivers. There are many different models, so I have posted the drivers here.
If your USB adapter is shown below, click on the image to download the drivers:
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