Fingerprint reader quit working PLEASE HELP

Question

Help! I have tried seaching these forums, and nothing has worked.
My fingerprint reader was working fine this morning when I signed into windows.  A couple of hours later, it just stopped working.  HP Simple Pass seems to not even recognize it anymore.
I have tried restoring my system.  Did not work.
I have tried re-installing the driver for the fingerprint reader from HP.  Did not work.
Biometric Devices does not even show up in my device manager.
I am stuck, and I would really like to have this working again.  Any help would be GREATLY appreciated.
I have a Pavilion dv6.
Model #:  A3E82AV
BIOS:  F.26 - 04/03/2013 (0790100000205710000620100)
Windows 7 Home Premium 64 bit
Thank you
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Answer 1

You did not state your OS:  Assuming Windows 8 - 64bit
HP Pavilion dv6t-7000 CTO Entertainment Notebook PC Drivers & Downloads
Assuming you are on the latest HP SimplePass as shown on your website --
this is important and where you need to be:
 sp61399 HP SimplePass V6.0.100.272 Win7-8
NOTE: This version runs on Windows 7 AND Windows 8
==================================================================================
When you say that you reinstalled the Driver from HP,
Did you download and install the driver from your Website?
Validity Sensor Driver:
sp58900 Validity Sensor V4.4.234.0
==================================================================================
You might try the following:
Notebooks- Power Reset to Resolve Hardware and Software Issues- Sealed Non-Removable Battery
OR                                                  
Notebooks - Power Reset to Resolve Hardware and Software Issues - Removable Battery
The Power Reset cannot tell the difference between drivers - it does not analyze a driver before applying it.
EXAMPLE:
If the driver on disk is the wrong driver before the Reset, it is still the wrong driver after the Reset.
If the driver INSTRUCTIONS are tangled, messed up, or missing, then the Reset may fix the problem.
Why a Power Reset works to fix some issues: 
The Power Reset does not install anything on your computer, it does not remove anything from your computer, and the Reset does not "change" anything on your computer.  Your data and programs remain as they were before the reset was applied.  The Reset drains out the old instructions and makes the computer go to the Operating System on disk to get new instructions.
Why a Power Reset might Not Work:
If the issue is more than just entanglement, if the "good instructions" on the computer are not good enough -- that is, you need an update, a new driver, or there is a problem that cannot be "untangled", then the Reset will not work.
If there is a hardware problem the Power Reset will not work.
===================================================================================
If No Joy:
Assuming that you can at least now see the Validity Sensor Driver in Device Manager > Biometrics
Then
Download your Validity Sensor Driver:
sp58900 Validity Sensor V4.4.234.0
Open Control Panel > Device Manager > Open your Biometric Devices >
Right Click on your Validity Sensor Driver > Uninstall (AND Tick to delete)
Reboot the Notebook and log in
Install the downloaded Validity Sensor driver
Reboot the Notebook and log in
====================================================================================
A suggestion:
Do not skip the requested reboots...
Good Luck!
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