If you've got a 64-bit version of Office installed, you can't install the 32-bit driver. There doesn't seem to be a sensible reason for this, but you'd have to ask Microsoft for a definitive answer. Depending on the files you're reading, you might be able to get away with installing the Office 2007 version[^] of the driver, as suggested in this SO answer[^]. The 2007 drivers were 32-bit only, and shouldn't be blocked by the 64-bit version of Office 2010.
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