The A200 USB cable (301-0097) is now discontinued and no longer available to purchase. If you want to connect the A200 over USB please read the following FAQ
However, if you already have the USB cable this article will still be relevant.
The A200 USB cable uses a Prolific USB-to-Serial bridge. The driver is Microsoft WHQL-certified and is distributed through Windows Update.
If the driver is not installed automatically when you connect the cable, open Settings > Windows Update and select Check for updates. On some systems, the driver may appear under Optional updates (Settings > Windows Update > Advanced options > Optional updates). Install the available Prolific USB-to-Serial driver, then reconnect the cable if prompted.