Pavilion dv7 fingerprint reader stops working after several hibernate/suspend cycles

After severl hibernate cycles, the fingerprint reader on my Pavilion dv7 latop stops working. The indicator LED no longer flashes (in either colour), and nothing happens when I scan my fingerprint. I'm forced to revert to password login.
This has been an issue since getting the laptop. Fingerprint scanning works fine at first after a reboot, but when I hibernate (or, for that matter, suspend) the laptop after using, I'm never sure whether the scanner is going to work when I restart it. Sometimes it does, sometimes it doesn't, and the only way that I've so far found to fix it is to reboot.
I've tried using installing the latest driver from HP's support site, although it seems to be dated May, 2011, and, interestingly, claims to fix a problem with not restarting after several hibernate cycles (hint: it doesn't). I've tried uninstalling and then re-installing the driver. Doesn't seem to make much difference.
Laptop is an HP Pavilion dv7-6166nr with Windows 7 64-bit Professional installed (although the problem was present with the factory-installed Windows 7 Home Premium).

Try downloading and running the HP Support Assistant if you have not already. It can search for updates for you specific to your notebook. Here is a link to the download: http://goo.gl/gvpTr
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