I turn on my laptop and then ask me for password. When I enter the password, appears a screen message told me that it is loading my information and then it turns off.
That could be a number of things but firstly, are you able to access your desktop through Safe Mode or Last Known Good Configuration? It could be anything ranging from a damaged registry to a virus to a hardware device malfunctioning (very badly!)
I would firstly try to gain access through Safe Mode and run a virus scan to see if anything obvious is picked up.
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