Hi Robin,

Welcome to the Community, Below is the only link that I could come up with, for the Vostro 3550, let us know if this worked.

Hope this helps.

Thank you

Royan

I have the same problem and Dell support team can't help me too. So I deside to help myself. Today I find solution.

You have only driver for biometric sensor (from Dell download center). But you also must have the software (that Dell team is forget to provide for customers).

You need to go http://www.validityinc.com/post.aspx?id=186 (site of manufacturer of our biometric sensor) and download the "Validity Sensor's Windows 7 Biometric Framework (WBF) software" (direct link: http://www.validityinc.com/news/wp-content/uploads/windows_wbf_tek_4_3_34_0_digital_persona_fma.zip)

After unzipping and installing WBF software go to the Control Panel and you'll find new control "Biometric devices". There you can register your fingerprint and configure entering in OS.

PS. I'm already using this software 6 monthes and sometimes (<5% of starts) Windows don't propose to pass by fingerprint, only password. But this is not a big problem as for me.