Hey iviarck!
I am sorry to hear that you are not able to use your fingerprint reader properly. :( I will do my best in hopefully being able to resolve the issue. I have included the document 'Troubleshooting a Fingerprint Reader (Windows 8)'. The main steps that you will want to take a look at are under the Fingerprint reader does not work after computer wakes from Sleep mode.
Please let me know the outcome of the troubleshooting steps.
Good Luck! :)