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I work with USB-serial converters at work all the time. I was working from home recently and needed a converter. Didn't want to drive all the way into work, so I dropped over to Best Buy and picked up one of these. I followed the instructions in others reviews to download the Win 7 driver off the web. I got it working, but it's very flaky and after a while it will freeze the Win 7 OS. Locks it up solid, not even a blue screen. This product is a complete waste of time and is overpriced even if it did work reliably. Ended up having to restore my Win7 system to remove the driver.