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Use Google to determine if others have similar problems (my diagnosis could be wrong; you may find a solution).
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Search the vendor's site for a newer version.
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Pester the vendor for a bugfix.
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Test older versions.
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Determine if the converter is similar or identical to other converters and use the driver from the other converter (this one entails modifying or creating an INF file).
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Stop wasting your time and buy a board from a reputable vendor.