Windows logon and Credential Providers

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C++

Windows

Please, somebody explain me how to create a working Credential Provider! I am using the HardwareEventCredentialProvider sample as a base to build my own Provider on top of. I've changed username and password fields, but it seems doesn't work. After submitting credentials to a system I only see a blank screen for a sec. or receive a message "Incorrect password or username" and then authentication starts again...
What I need to do in GetSerialization() and SetSerialization() methods to log in with existing user?(username=L"virt naXa!", password=L"1234")

I've read "Credential Provider Technical Reference", Dan Griffin's article about CPs in Vista, and a lot of other articles in the Web and still don't understand how can I log in using credential providers..

And I'm sorry for my bad English, it's not my native language:)

If you need to take a look at my code, please click here.