Are there any CP210x driver compatibility issues with Windows 7?
The CP210x devices are fully supported under the 32-bit and 64-bit versions of Windows. The latest WHQL-certified drivers are available for download here: http://www.silabs.com/mcudownloads
The 64-bit versions of Windows require that a driver is WHQL-certified before it will install. The CP210x driver available on the Silicon Labs website is WHQL-certified, but customizing the driver will break that certification. For testing purposes, you can also temporarily disable the Windows 7 check for a certified driver. See the related articles for more information about certifying your customized driver and temporarily disabling the check.