The way it worked for me (HP 6570b, Windows 8 x64, Validity VFS491): I did a clean Windows installation without HP software (bloatware?) like ProtectTools and the rest.
All you need to make fingerprint work with Windows is:
Install the driver from HP
Install latest software directly from Validity. Drivers are also included – maybe it works without HP driver installed, which I didn't test. I installed the latest available which was
Windows_WBF_Validity_FMA_Setup_4_5_105_1.zip
.
After installation go to Control Panel » All Control Panel Items » Biometric Devices and enroll your fingers…