See: The device came with a DVD with about 20 different drivers, however Windows refuses to install these older drivers, instead installing version 3.8.1.3 () and stating The best driver software for your device is already installed, ignoring the supplied drivers even when I select them for installation. (Code 31)" The VID and PID indicate Prolific USB-to Serial Comm Port 067B & 2303 Windows has installed driver version 3.8.1.3 My best guess is that the hardware is either old or using a cloned Prolific chip. The Driver you choose should read '3.3.2.102 with an appropriate date attached. Scroll to the LPT/COM port and double click Prolific USB to Serial Comm Port. Upon installation (Win7) device manager flags the driver as bad with the yellow! Device status is reported as "This device is not working properly because Windows cannot load the drivers required for this device. From your control panel navigate to the System category and click the Hardware tab. Yesterday I purchased a USB to RS232 converter from a local electronics retailer.
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