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Why sign program starts phenomenon sometimes occurs when the machine?

Because your computer during use, careless damage to the fingerprint device drivers, please uninstall the fingerprint capture device driver, then reinstall, this problem will be solved. Complete uninstall as follows:
1)Run the Control Panel's "Add / Remove" programs, uninstall the fingerprint device driver;
2)In the Start menu's "Run" to run "Regedit.exe", the HKEY_LOCAL_MACHINESoftwareDigitalPersona key removed; 3)Windowssystem directory DP *. dll delete all
4)Program filesDigitalPersona delete the whole directory.
In addition, the sign program started, the fingerprint image window display black bars do not display the fingerprint, the solution above.

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