Are you sure that you really need a device driver at all? Most memory card readers come with a driver CD, but usually the driver CD is not necessary. For Win7 I doubt that you need to install the driver, for XP maybe.
>One of my large clients needs to get windows drivers written for XP and Win7 to access a write once SD type memory device.
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>If you have experience (good experience!!) developing device drivers for Windows, send me an email with contact info and relevant job/project history and I'll forward your info to my client.